diff --git a/syncplay/constants.py b/syncplay/constants.py
index cba53af..507e24e 100644
--- a/syncplay/constants.py
+++ b/syncplay/constants.py
@@ -224,4 +224,10 @@ SYNCPLAY_PUBLIC_SERVER_LIST_URL = u"http://syncplay.pl/listpublicservers?{}" # P
 DEFAULT_TRUSTED_DOMAINS = [u"youtube.com",u"youtu.be"]
 TRUSTABLE_WEB_PROTOCOLS = [u"http://www.",u"https://www.",u"http://",u"https://"]
 
-PRIVATE_FILE_FIELDS = ["path"]
\ No newline at end of file
+PRIVATE_FILE_FIELDS = ["path"]
+
+OS_WINDOWS = "win"
+OS_LINUX = "linux"
+OS_OSX = "darwin"
+OS_BSD = "freebsd"
+OS_DRAGONFLY = "dragonfly"
\ No newline at end of file
diff --git a/syncplay/players/mplayer.py b/syncplay/players/mplayer.py
index 9e5f855..56e6b4e 100644
--- a/syncplay/players/mplayer.py
+++ b/syncplay/players/mplayer.py
@@ -6,6 +6,7 @@ from syncplay.players.basePlayer import BasePlayer
 from syncplay import constants, utils
 from syncplay.messages import getMessage
 import os, sys
+from syncplay.utils import isWindows
 
 class MplayerPlayer(BasePlayer):
     speedSupported = True
@@ -282,7 +283,7 @@ class MplayerPlayer(BasePlayer):
 
             call = [playerPath]
             if filePath:
-                if sys.platform.startswith('win') and not utils.isASCII(filePath):
+                if isWindows() and not utils.isASCII(filePath):
                     self.__playerController.delayedFilePath = filePath
                     filePath = None
                 else:
diff --git a/syncplay/players/vlc.py b/syncplay/players/vlc.py
index dde4d5b..2a4cd77 100755
--- a/syncplay/players/vlc.py
+++ b/syncplay/players/vlc.py
@@ -11,6 +11,7 @@ import asynchat, asyncore
 import urllib
 import time
 from syncplay.messages import getMessage
+from syncplay.utils import isBSD, isLinux, isWindows, isOSX
 
 class VlcPlayer(BasePlayer):
     speedSupported = True
@@ -20,7 +21,7 @@ class VlcPlayer(BasePlayer):
 
     RE_ANSWER = re.compile(constants.VLC_ANSWER_REGEX)
     SLAVE_ARGS = constants.VLC_SLAVE_ARGS
-    if sys.platform.startswith('darwin'):
+    if isOSX():
         SLAVE_ARGS.extend(constants.VLC_SLAVE_OSX_ARGS)        
     else:     
         SLAVE_ARGS.extend(constants.VLC_SLAVE_NONOSX_ARGS)
@@ -146,7 +147,7 @@ class VlcPlayer(BasePlayer):
         fileURL = fileURL.replace(u'\\', u'/')
         fileURL = fileURL.encode('utf8')
         fileURL = urllib.quote_plus(fileURL)
-        if sys.platform.startswith('win'):
+        if isWindows():
             fileURL = "file:///" + fileURL
         else:
             fileURL = "file://" + fileURL
@@ -331,13 +332,13 @@ class VlcPlayer(BasePlayer):
                                     return False
                 playerController._client.ui.showErrorMessage(getMessage("vlc-interface-not-installed"))
                 return False
-            if sys.platform.startswith('linux'):
+            if isLinux():
                 playerController.vlcIntfPath = "/usr/lib/vlc/lua/intf/"
                 playerController.vlcIntfUserPath = os.path.join(os.getenv('HOME', '.'), ".local/share/vlc/lua/intf/")
-            elif sys.platform.startswith('darwin'):
+            elif isOSX():
                 playerController.vlcIntfPath = "/Applications/VLC.app/Contents/MacOS/share/lua/intf/"
                 playerController.vlcIntfUserPath = os.path.join(os.getenv('HOME', '.'), "Library/Application Support/org.videolan.vlc/lua/intf/")
-            elif 'bsd' in sys.platform or sys.platform.startswith('dragonfly'):
+            elif isBSD():
                 # *BSD ports/pkgs install to /usr/local by default.
                 # This should also work for all the other BSDs, such as OpenBSD or DragonFly.
                 playerController.vlcIntfPath = "/usr/local/lib/vlc/lua/intf/"
@@ -349,7 +350,7 @@ class VlcPlayer(BasePlayer):
             if _usevlcintf(playerController.vlcIntfPath, playerController.vlcIntfUserPath):
                 playerController.SLAVE_ARGS.append('--lua-config=syncplay={{port=\"{}\"}}'.format(str(playerController.vlcport)))
             else:
-                if sys.platform.startswith('linux'):
+                if isLinux():
                     playerController.vlcDataPath = "/usr/lib/syncplay/resources"
                 else:
                     playerController.vlcDataPath = utils.findWorkingDir() + "\\resources"
@@ -387,7 +388,7 @@ class VlcPlayer(BasePlayer):
                                 playerController._client.ui.showErrorMessage(
                                     getMessage("media-player-error").format(line), True)
                                 break
-                if not sys.platform.startswith('darwin'):
+                if not isOSX():
                     self.__process.stderr = None
                 else:
                     vlcoutputthread = threading.Thread(target = self.handle_vlcoutput, args=())
@@ -401,7 +402,7 @@ class VlcPlayer(BasePlayer):
                 self._sendingData = threading.Lock()
 
         def _shouldListenForSTDOUT(self):
-            if sys.platform.startswith('win'):
+            if isWindows():
                 return False # Due to VLC3 not using STDOUT/STDERR
             else:
                 return True
diff --git a/syncplay/ui/ConfigurationGetter.py b/syncplay/ui/ConfigurationGetter.py
index 79e4f1e..67b515d 100755
--- a/syncplay/ui/ConfigurationGetter.py
+++ b/syncplay/ui/ConfigurationGetter.py
@@ -6,6 +6,7 @@ import ast
 from syncplay import constants, utils, version, milestone
 from syncplay.messages import getMessage, setLanguage, isValidLanguage
 from syncplay.players.playerFactory import PlayerFactory
+from syncplay.utils import isOSX
 import codecs
 
 class InvalidConfigValue(Exception):
@@ -411,7 +412,7 @@ class ConfigurationGetter(object):
 	            if QCoreApplication.instance() is None:
 	              self.app = QtWidgets.QApplication(sys.argv)
 	            qt5reactor.install()
-	            if sys.platform.startswith('darwin'):
+	            if isOSX():
 	                import appnope
 	                appnope.nope()
             except ImportError:
diff --git a/syncplay/ui/GuiConfiguration.py b/syncplay/ui/GuiConfiguration.py
index 2cda809..fd09cf4 100755
--- a/syncplay/ui/GuiConfiguration.py
+++ b/syncplay/ui/GuiConfiguration.py
@@ -12,6 +12,7 @@ import sys
 import threading
 from syncplay.messages import getMessage, getLanguages, setLanguage, getInitialLanguage
 from syncplay import constants
+from syncplay.utils import isBSD, isLinux, isWindows, isOSX
 
 class GuiConfiguration:
     def __init__(self, config, error=None, defaultConfig=None):
@@ -238,11 +239,11 @@ class ConfigDialog(QtWidgets.QDialog):
                 defaultdirectory = os.environ["ProgramFiles"]
             elif "PROGRAMW6432" in os.environ:
                 defaultdirectory = os.environ["ProgramW6432"]
-        elif sys.platform.startswith('linux'):
+        elif isLinux():
             defaultdirectory = "/usr/bin"
-        elif sys.platform.startswith('darwin'):
+        elif isOSX():
             defaultdirectory = "/Applications/"
-        elif "bsd" in sys.platform or sys.platform.startswith('dragonfly'):
+        elif isBSD():
             defaultdirectory = "/usr/local/bin"
 
         fileName, filtr = QtWidgets.QFileDialog.getOpenFileName(self,
@@ -250,7 +251,7 @@ class ConfigDialog(QtWidgets.QDialog):
                 defaultdirectory,
                 browserfilter, "", options)
         if fileName:
-            if sys.platform.startswith('darwin') and fileName.endswith('.app'):  # see GitHub issue #91
+            if isOSX() and fileName.endswith('.app'):  # see GitHub issue #91
                 # Mac OS X application bundles contain a Info.plist in the Contents subdirectory of the .app.
                 # This plist file includes the 'CFBundleExecutable' key, which specifies the name of the
                 # executable.  I would have used plistlib here, but since the version of this library in
@@ -1109,7 +1110,7 @@ class ConfigDialog(QtWidgets.QDialog):
         self.QtWidgets = QtWidgets
         self.QtGui = QtGui
         self.error = error
-        if sys.platform.startswith('win'):
+        if isWindows():
             resourcespath = utils.findWorkingDir() + "\\resources\\"
         else:
             resourcespath = utils.findWorkingDir() + u"/resources/"
diff --git a/syncplay/ui/gui.py b/syncplay/ui/gui.py
index de9c823..5c7359d 100755
--- a/syncplay/ui/gui.py
+++ b/syncplay/ui/gui.py
@@ -9,12 +9,13 @@ import sys
 import time
 import urllib
 from datetime import datetime
+from syncplay.utils import isLinux, isWindows, isOSX
 import re
 import os
 from syncplay.utils import formatTime, sameFilename, sameFilesize, sameFileduration, RoomPasswordProvider, formatSize, isURL
 from functools import wraps
 from twisted.internet import task
-if sys.platform.startswith('darwin') and IsPySide: 
+if isOSX() and IsPySide: 
     from Foundation import NSURL
 lastCheckedForUpdates = None
 
@@ -34,7 +35,7 @@ class UserlistItemDelegate(QtWidgets.QStyledItemDelegate):
         if column == constants.USERLIST_GUI_USERNAME_COLUMN:
             currentQAbstractItemModel = indexQModelIndex.model()
             itemQModelIndex = currentQAbstractItemModel.index(indexQModelIndex.row(), constants.USERLIST_GUI_USERNAME_COLUMN, indexQModelIndex.parent())
-            if sys.platform.startswith('win'):
+            if isWindows():
                 resourcespath = utils.findWorkingDir() + u"\\resources\\"
             else:
                 resourcespath = utils.findWorkingDir() + u"/resources/"
@@ -65,7 +66,7 @@ class UserlistItemDelegate(QtWidgets.QStyledItemDelegate):
             if isUserRow:
                 optionQStyleOptionViewItem.rect.setX(optionQStyleOptionViewItem.rect.x()+constants.USERLIST_GUI_USERNAME_OFFSET)
         if column == constants.USERLIST_GUI_FILENAME_COLUMN:
-            if sys.platform.startswith('win'):
+            if isWindows():
                 resourcespath = utils.findWorkingDir() + u"\\resources\\"
             else:
                 resourcespath = utils.findWorkingDir() + u"/resources/"
@@ -90,18 +91,18 @@ class UserlistItemDelegate(QtWidgets.QStyledItemDelegate):
         QtWidgets.QStyledItemDelegate.paint(self, itemQPainter, optionQStyleOptionViewItem, indexQModelIndex)
 
 class AboutDialog(QtWidgets.QDialog):
-    if sys.platform.startswith('win'):
+    if isWindows():
          resourcespath = utils.findWorkingDir() + u"\\resources\\"
     else:
          resourcespath = utils.findWorkingDir() + u"/resources/"      
  
     def __init__(self, parent=None):
          super(AboutDialog, self).__init__(parent)
-         if sys.platform.startswith('darwin'):
+         if isOSX():
              self.setWindowTitle("")
          else:
              self.setWindowTitle(getMessage("about-dialog-title"))
-             if sys.platform.startswith('win'):
+             if isWindows():
                 self.setWindowFlags(self.windowFlags() & ~Qt.WindowContextHelpButtonHint) 			 
          nameLabel = QtWidgets.QLabel("<center><strong>Syncplay</strong></center>")
          nameLabel.setFont(QtGui.QFont("Helvetica", 20))
@@ -131,13 +132,13 @@ class AboutDialog(QtWidgets.QDialog):
          self.setLayout(aboutLayout)
 
     def openLicense(self):
-         if sys.platform.startswith('win'):
+         if isWindows():
              QtGui.QDesktopServices.openUrl(QUrl("file:///" + self.resourcespath + u"license.rtf"))
          else:
              QtGui.QDesktopServices.openUrl(QUrl("file://" + self.resourcespath + u"license.rtf"))
          
     def openDependencies(self):
-         if sys.platform.startswith('win'):
+         if isWindows():
              QtGui.QDesktopServices.openUrl(QUrl("file:///" + self.resourcespath + u"third-party-notices.rtf"))
          else:
              QtGui.QDesktopServices.openUrl(QUrl("file://" + self.resourcespath + u"third-party-notices.rtf"))
@@ -160,7 +161,7 @@ class MainWindow(QtWidgets.QMainWindow):
             itemQPainter.save()
             currentQAbstractItemModel = indexQModelIndex.model()
             currentlyPlayingFile = currentQAbstractItemModel.data(indexQModelIndex, Qt.UserRole + constants.PLAYLISTITEM_CURRENTLYPLAYING_ROLE)
-            if sys.platform.startswith('win'):
+            if isWindows():
                 resourcespath = utils.findWorkingDir() + u"\\resources\\"
             else:
                 resourcespath = utils.findWorkingDir() + u"/resources/"
@@ -219,7 +220,7 @@ class MainWindow(QtWidgets.QMainWindow):
                 indexRow = window.playlist.count() if window.clearedPlaylistNote else 0
 
                 for url in urls[::-1]:
-                    if sys.platform.startswith('darwin') and IsPySide:
+                    if isOSX() and IsPySide:
                         dropfilepath = os.path.abspath(NSURL.URLWithString_(str(url.toString())).filePathURL().path())
                     else:
                         dropfilepath = os.path.abspath(unicode(url.toLocalFile()))                    
@@ -324,7 +325,7 @@ class MainWindow(QtWidgets.QMainWindow):
                 if indexRow == -1:
                     indexRow = window.playlist.count()
                 for url in urls[::-1]:
-                    if sys.platform.startswith('darwin') and IsPySide:
+                    if isOSX() and IsPySide:
                         dropfilepath = os.path.abspath(NSURL.URLWithString_(str(url.toString())).filePathURL().path())
                     else:
                         dropfilepath = os.path.abspath(unicode(url.toLocalFile())) 
@@ -567,7 +568,7 @@ class MainWindow(QtWidgets.QMainWindow):
     @needsClient
     def openPlaylistMenu(self, position):
         indexes = self.playlist.selectedIndexes()
-        if sys.platform.startswith('win'):
+        if isWindows():
             resourcespath = utils.findWorkingDir() + u"\\resources\\"
         else:
             resourcespath = utils.findWorkingDir() + u"/resources/"
@@ -609,7 +610,7 @@ class MainWindow(QtWidgets.QMainWindow):
     def openRoomMenu(self, position):
         # TODO: Deselect items after right click
         indexes = self.listTreeView.selectedIndexes()
-        if sys.platform.startswith('win'):
+        if isWindows():
             resourcespath = utils.findWorkingDir() + u"\\resources\\"
         else:
             resourcespath = utils.findWorkingDir() + u"/resources/"
@@ -872,7 +873,7 @@ class MainWindow(QtWidgets.QMainWindow):
             return
 
         self.loadMediaBrowseSettings()
-        if sys.platform.startswith('darwin') and IsPySide:
+        if isOSX() and IsPySide:
             options = QtWidgets.QFileDialog.Options(QtWidgets.QFileDialog.DontUseNativeDialog)
         else:
             options = QtWidgets.QFileDialog.Options()
@@ -886,7 +887,7 @@ class MainWindow(QtWidgets.QMainWindow):
         fileName, filtr = QtWidgets.QFileDialog.getOpenFileName(self, getMessage("browseformedia-label"), defaultdirectory,
                                                             browserfilter, "", options)
         if fileName:
-            if sys.platform.startswith('win'):
+            if isWindows():
                 fileName = fileName.replace("/", "\\")
             self.mediadirectory = os.path.dirname(fileName)
             self._syncplayClient.fileSwitch.setCurrentDirectory(self.mediadirectory)
@@ -900,7 +901,7 @@ class MainWindow(QtWidgets.QMainWindow):
             return
 
         self.loadMediaBrowseSettings()
-        if sys.platform.startswith('darwin') and IsPySide:
+        if isOSX() and IsPySide:
              options = QtWidgets.QFileDialog.Options(QtWidgets.QFileDialog.DontUseNativeDialog)
         else:
              options = QtWidgets.QFileDialog.Options()
@@ -916,7 +917,7 @@ class MainWindow(QtWidgets.QMainWindow):
         self.updatingPlaylist = True
         if fileNames:
             for fileName in fileNames:
-                if sys.platform.startswith('win'):
+                if isWindows():
                     fileName = fileName.replace("/", "\\")
                 self.mediadirectory = os.path.dirname(fileName)
                 self._syncplayClient.fileSwitch.setCurrentDirectory(self.mediadirectory)
@@ -1051,7 +1052,7 @@ class MainWindow(QtWidgets.QMainWindow):
 
     @needsClient
     def openAddMediaDirectoryDialog(self, MediaDirectoriesTextbox, MediaDirectoriesDialog):
-        if sys.platform.startswith('darwin') and IsPySide:
+        if isOSX() and IsPySide:
             options = QtWidgets.QFileDialog.Options(QtWidgets.QFileDialog.ShowDirsOnly | QtWidgets.QFileDialog.DontUseNativeDialog)
         else:
             options = QtWidgets.QFileDialog.Options(QtWidgets.QFileDialog.ShowDirsOnly)        
@@ -1121,9 +1122,9 @@ class MainWindow(QtWidgets.QMainWindow):
                 self.showErrorMessage(getMessage("invalid-offset-value"))
 
     def openUserGuide(self):
-        if sys.platform.startswith('linux'):
+        if isLinux():
             self.QtGui.QDesktopServices.openUrl(QUrl("http://syncplay.pl/guide/linux/"))
-        elif sys.platform.startswith('win'):
+        elif isWindows():
             self.QtGui.QDesktopServices.openUrl(QUrl("http://syncplay.pl/guide/windows/"))
         else:
             self.QtGui.QDesktopServices.openUrl(QUrl("http://syncplay.pl/guide/"))
@@ -1452,7 +1453,7 @@ class MainWindow(QtWidgets.QMainWindow):
                                                            getMessage("update-menu-label"))
         window.updateAction.triggered.connect(self.userCheckForUpdates)
 		
-        if not sys.platform.startswith('darwin'):
+        if not isOSX():
      	    window.helpMenu.addSeparator()
             window.about = window.helpMenu.addAction(QtGui.QPixmap(self.resourcespath + 'syncplay.png'),
                                                            getMessage("about-menu-label"))
@@ -1461,7 +1462,7 @@ class MainWindow(QtWidgets.QMainWindow):
         window.about.triggered.connect(self.openAbout)
 
         window.menuBar.addMenu(window.helpMenu)
-        if not sys.platform.startswith('darwin'):
+        if not isOSX():
             window.mainLayout.setMenuBar(window.menuBar)
 
     def openAbout(self):
@@ -1597,7 +1598,7 @@ class MainWindow(QtWidgets.QMainWindow):
         data = event.mimeData()
         urls = data.urls()
         if urls and urls[0].scheme() == 'file':
-            if sys.platform.startswith('darwin') and IsPySide:
+            if isOSX() and IsPySide:
                 dropfilepath = os.path.abspath(NSURL.URLWithString_(str(url.toString())).filePathURL().path())
             else:
                 dropfilepath = os.path.abspath(unicode(url.toLocalFile()))
@@ -1732,11 +1733,11 @@ class MainWindow(QtWidgets.QMainWindow):
         self._syncplayClient = None
         self.folderSearchEnabled = True
         self.QtGui = QtGui
-        if sys.platform.startswith('win'):
+        if isWindows():
             self.resourcespath = utils.findWorkingDir() + u"\\resources\\"
         else:
             self.resourcespath = utils.findWorkingDir() + u"/resources/"
-        if sys.platform.startswith('darwin'):
+        if isOSX():
             self.setWindowFlags(self.windowFlags())
         else:
             self.setWindowFlags(self.windowFlags() & Qt.AA_DontUseNativeMenuBar)
diff --git a/syncplay/utils.py b/syncplay/utils.py
index 1a7a8ff..5827c8a 100644
--- a/syncplay/utils.py
+++ b/syncplay/utils.py
@@ -17,6 +17,18 @@ import subprocess
 
 folderSearchEnabled = True
 
+def isWindows():
+    return sys.platform.startswith(constants.OS_WINDOWS)
+
+def isLinux():
+    return sys.platform.startswith(constants.OS_LINUX)
+
+def isOSX():
+    return sys.platform.startswith(constants.OS_OSX)
+
+def isBSD():
+    return constants.OS_BSD in sys.platform or sys.platform.startswith(constants.OS_DRAGONFLY)
+
 def retry(ExceptionToCheck, tries=4, delay=3, backoff=2, logger=None):
     """Retry calling the decorated function using an exponential backoff.