diff --git a/.appveyor.yml b/.appveyor.yml
index 1a9351d..824e7d1 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,44 +1,44 @@
 environment:
   MINICONDA: "C:\\Miniconda"
-  clone_folder: c:\projects\syncplay
-
-image:
-  - Visual Studio 2013
 
 platform: x86
 
 configuration: Release
 
 init:
-  - set PATH=C:\Miniconda;C:\Miniconda\Scripts;%PATH%
-  - cmd: conda create -n syncplay -y  
-  - cmd: activate syncplay
-  - cmd: conda install python pywin32 pyside -y
-  - cmd: pip install twisted py2exe_py2 zope.interface
-  - cmd: type nul > C:\Miniconda\envs\syncplay\lib\site-packages\zope\__init__.py
-  - cmd: pip freeze
-  - cmd: conda list
+  - set PATH=C:\Miniconda;C:\Miniconda\Scripts;C:\Program Files (x86)\NSIS;%PATH%
+  - conda create -n syncplay -y
+  - activate syncplay
+  - conda install python pywin32 pyside -y
+  - pip install twisted py2exe_py2 zope.interface
+  - type nul > C:\Miniconda\envs\syncplay\lib\site-packages\zope\__init__.py
+  - pip freeze
+  - conda list
   
 install:
-  - cmd: cd c:\projects\syncplay
-  - cmd: python buildPy2exe.py
-  - cmd: del C:\projects\syncplay\syncplay_v1.5.0\lib\DNSAPI.dll
-  - cmd: del C:\projects\syncplay\syncplay_v1.5.0\lib\MPR.dll
-  - cmd: mkdir C:\projects\syncplay\syncplay_v1.5.0\platforms
-  #- cmd: copy C:\Miniconda\envs\syncplay\library\plugins\platforms\qwindows.dll C:\projects\syncplay\syncplay_v1.5.0\platforms\
+  - cd %APPVEYOR_BUILD_FOLDER%
+  - for /F "tokens=2 delims='" %%a in ('findstr version syncplay\__init__.py') do @set ver=%%a
+  - python buildPy2exe.py
+  - del syncplay_v%ver%\lib\MPR.dll
+  - mkdir syncplay_v%ver%\platforms
+  #- copy C:\Miniconda\envs\syncplay\library\plugins\platforms\qwindows.dll C:\projects\syncplay\syncplay_v1.5.0\platforms\
 
 # Not a project with an msbuild file, build done at install.
 build: off 
 
 artifacts:
-  path: 'syncplay_v1.5.0'
-  type: zip
-  name: Syncplay_win
+  - path: 'syncplay_v$(ver)'
+    type: zip
+    name: Syncplay-$(ver)-win
+
+  - path: Syncplay-$(ver)-Setup.exe
+    name: Syncplay-$(ver)-win-setup
 
 # Push artefact to S3 bucket and list all
 before_deploy:
-  - cmd: dir
-  #- cmd: python -c "from PySide2 import QtCore; print QtCore.QLibraryInfo.location(QtCore.QLibraryInfo.PluginsPath)"
+  - dir
+  #- python -c "from PySide2 import QtCore; print QtCore.QLibraryInfo.location(QtCore.QLibraryInfo.PluginsPath)"
+
 
 # Deploy build to BinTray
 deploy:
@@ -51,4 +51,5 @@ deploy:
   package: Syncplay
   version: "test"
   publish: true
-  override: true
\ No newline at end of file
+  override: true
+    
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 8309fad..9b9e6b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ venv
 /build
 /dist
 /syncplay v*
+/syncplay_v*
 syncplay_setup.nsi
 dist.7z
 .*
diff --git a/.travis.yml b/.travis.yml
index ef95684..26836c0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,7 +25,8 @@ before_deploy:
 - mv resources/macos_vlc_install.command resources/.macos_vlc_install.command
 - mv resources/lua/intf/syncplay.lua resources/lua/intf/.syncplay.lua
 - mv resources/macOS_readme.pdf resources/.macOS_readme.pdf
-- dmgbuild -s appdmg.py "Syncplay" dist_dmg/Syncplay_macOS.dmg
+- export VER="$(cat syncplay/__init__.py | awk '/version/ {gsub("\047", "", $3); print $NF}')"
+- dmgbuild -s appdmg.py "Syncplay" dist_dmg/Syncplay_$(VER)_macOS.dmg
 
 deploy:
   on: master_local
diff --git a/bintray.json b/bintray.json
index 9da4879..830cb2a 100644
--- a/bintray.json
+++ b/bintray.json
@@ -16,4 +16,4 @@
            "override": 1 }}
 	    ],
     "publish": true
-}
\ No newline at end of file
+}
diff --git a/buildPy2exe.py b/buildPy2exe.py
index 452a359..6b2100c 100755
--- a/buildPy2exe.py
+++ b/buildPy2exe.py
@@ -5,7 +5,7 @@
 
 ) If you get the error "ImportError: No module named zope.interface" then add an empty __init__.py file to the PYTHONDIR/Lib/site-packages/zope directory
 
-2) It is expected that you will have NSIS 3  NSIS from http://nsis.sourceforge.net installed to: C:\Program Files (x86)\NSIS\
+2) It is expected that you will have NSIS 3 NSIS from http://nsis.sourceforge.net installed.
 
 '''
 
@@ -31,8 +31,21 @@ if missingStrings is not None and missingStrings is not "":
     import warnings
     warnings.warn("MISSING/UNUSED STRINGS DETECTED:\n{}".format(missingStrings))
 
-p = "C:\\Program Files (x86)\\NSIS\\makensis.exe" #TODO: how to move that into proper place, huh
-NSIS_COMPILE = p if os.path.isfile(p) else "makensis.exe"
+def get_nsis_path():
+    bin_name = "makensis.exe"
+    from _winreg import HKEY_LOCAL_MACHINE as HKLM
+    from _winreg import KEY_READ, KEY_WOW64_32KEY, OpenKey, QueryValueEx
+
+    try:
+        nsisreg = OpenKey(HKLM, "Software\\NSIS", 0, KEY_READ | KEY_WOW64_32KEY)
+        if QueryValueEx(nsisreg, "VersionMajor")[0] >= 3:
+            return "{}\\{}".format(QueryValueEx(nsisreg, "")[0], bin_name)
+        else:
+            raise Exception("You must install NSIS 3 or later.")
+    except WindowsError:
+        return bin_name
+NSIS_COMPILE = get_nsis_path()
+
 OUT_DIR = "syncplay_v{}".format(syncplay.version)
 SETUP_SCRIPT_PATH = "syncplay_setup.nsi"
 NSIS_SCRIPT_TEMPLATE = r"""
@@ -48,7 +61,7 @@ NSIS_SCRIPT_TEMPLATE = r"""
   Unicode true
 
   Name "Syncplay $version"
-  OutFile "Syncplay $version Setup.exe"
+  OutFile "Syncplay-$version-Setup.exe"
   InstallDir $$PROGRAMFILES\Syncplay
   RequestExecutionLevel admin
   XPStyle on
diff --git a/syncplay/__init__.py b/syncplay/__init__.py
index 02e8e74..2cf5466 100644
--- a/syncplay/__init__.py
+++ b/syncplay/__init__.py
@@ -1,4 +1,4 @@
-version = '1.5.0'
+version = '1.5.1'
 milestone = 'Yoitsu'
-release_number = '50'
+release_number = '51'
 projectURL = 'http://syncplay.pl/'
diff --git a/syncplay/constants.py b/syncplay/constants.py
index 707ccea..02913f4 100644
--- a/syncplay/constants.py
+++ b/syncplay/constants.py
@@ -9,7 +9,7 @@ UI_TIME_FORMAT = "[%X] "
 CONFIG_NAMES = [".syncplay", "syncplay.ini"]  #Syncplay searches first to last
 DEFAULT_CONFIG_NAME_WINDOWS = "syncplay.ini"
 DEFAULT_CONFIG_NAME_LINUX = ".syncplay"
-RECENT_CLIENT_THRESHOLD = "1.5.0"  #This and higher considered 'recent' clients (no warnings)
+RECENT_CLIENT_THRESHOLD = "1.5.1"  #This and higher considered 'recent' clients (no warnings)
 WARN_OLD_CLIENTS = True  #Use MOTD to inform old clients to upgrade
 LIST_RELATIVE_CONFIGS = True  # Print list of relative configs loaded
 SHOW_CONTACT_INFO = True  # Displays dev contact details below list in GUI
@@ -177,7 +177,7 @@ USERLIST_GUI_FILENAME_COLUMN = 3
 MPLAYER_SLAVE_ARGS = ['-slave', '--hr-seek=always', '-nomsgcolor', '-msglevel', 'all=1:global=4:cplayer=4', '-af-add', 'scaletempo']
 MPV_ARGS = ['--force-window', '--idle', '--hr-seek=always', '--keep-open']
 MPV_SLAVE_ARGS = ['--msg-level=all=error,cplayer=info,term-msg=info', '--input-terminal=no', '--input-file=/dev/stdin']
-MPV_SLAVE_ARGS_NEW = ['--term-playing-msg=<SyncplayUpdateFile>\nANS_filename=${filename}\nANS_length=${=length:${=duration:0}}\nANS_path=${path}\n</SyncplayUpdateFile>', '--terminal=yes']
+MPV_SLAVE_ARGS_NEW = ['--term-playing-msg=<SyncplayUpdateFile>\nANS_filename=${filename}\nANS_length=${=duration:${=length:0}}\nANS_path=${path}\n</SyncplayUpdateFile>', '--terminal=yes']
 MPV_NEW_VERSION = False
 VLC_SLAVE_ARGS = ['--extraintf=luaintf', '--lua-intf=syncplay', '--no-quiet', '--no-input-fast-seek',
                   '--play-and-pause', '--start-time=0']
diff --git a/syncplay/players/mpc.py b/syncplay/players/mpc.py
index 1dc3064..c274ef7 100644
--- a/syncplay/players/mpc.py
+++ b/syncplay/players/mpc.py
@@ -479,7 +479,7 @@ class MPCHCAPIPlayer(BasePlayer):
     
     @staticmethod
     def getIconPath(path):
-        if MPCHCAPIPlayer.getExpandedPath(path).lower().endswith(u'mpc-hc64.exe'.lower()):
+        if MPCHCAPIPlayer.getExpandedPath(path).lower().endswith(u'mpc-hc64.exe'.lower()) or MPCHCAPIPlayer.getExpandedPath(path).lower().endswith(u'mpc-hc64_nvo.exe'.lower()):
             return constants.MPC64_ICONPATH
         else:
             return constants.MPC_ICONPATH
@@ -493,7 +493,7 @@ class MPCHCAPIPlayer(BasePlayer):
     @staticmethod
     def getExpandedPath(path):
         if os.path.isfile(path):
-            if path.lower().endswith(u'mpc-hc.exe'.lower()) or path.lower().endswith(u'mpc-hc64.exe'.lower()):
+            if path.lower().endswith(u'mpc-hc.exe'.lower()) or path.lower().endswith(u'mpc-hc64.exe'.lower()) or path.lower().endswith(u'mpc-hc64_nvo.exe'.lower()) or path.lower().endswith(u'mpc-hc_nvo.exe'.lower()):
                 return path
         if os.path.isfile(path + u"mpc-hc.exe"):
             path += u"mpc-hc.exe"
@@ -501,9 +501,22 @@ class MPCHCAPIPlayer(BasePlayer):
         if os.path.isfile(path + u"\\mpc-hc.exe"):
             path += u"\\mpc-hc.exe"
             return path
+        if os.path.isfile(path + u"mpc-hc_nvo.exe"):
+            path += u"mpc-hc_nvo.exe"
+            return path
+        if os.path.isfile(path + u"\\mpc-hc_nvo.exe"):
+            path += u"\\mpc-hc_nvo.exe"
+            return path
         if os.path.isfile(path + u"mpc-hc64.exe"):
             path += u"mpc-hc64.exe"
             return path
         if os.path.isfile(path + u"\\mpc-hc64.exe"):
             path += u"\\mpc-hc64.exe"
             return path
+        if os.path.isfile(path + u"mpc-hc64_nvo.exe"):
+            path += u"mpc-hc64_nvo.exe"
+            return path
+        if os.path.isfile(path + u"\\mpc-hc64_nvo.exe"):
+            path += u"\\mpc-hc64_nvo.exe"
+            return path
+        
diff --git a/syncplay/players/mplayer.py b/syncplay/players/mplayer.py
index 56e6b4e..a0a610d 100644
--- a/syncplay/players/mplayer.py
+++ b/syncplay/players/mplayer.py
@@ -183,7 +183,10 @@ class MplayerPlayer(BasePlayer):
             self._storePauseState(bool(value == 'yes'))
             self._pausedAsk.set()
         elif name == "length":
-            self._duration = float(value)
+            try:
+                self._duration = float(value)
+            except:
+                self._duration = 0
             self._durationAsk.set()
         elif name == "path":
             self._filepath = value
diff --git a/syncplay/players/mpv.py b/syncplay/players/mpv.py
index 0278876..88bd7a3 100644
--- a/syncplay/players/mpv.py
+++ b/syncplay/players/mpv.py
@@ -124,7 +124,7 @@ class NewMpvPlayer(OldMpvPlayer):
         if property_ in floatProperties:
             propertyID = u"={}".format(property_)
         elif property_ == 'length':
-            propertyID = u'=length:${=duration:0}'
+            propertyID = u'=duration:${=length:0}'
         else:
             propertyID = property_
         self._listener.sendLine(u"print_text ""ANS_{}=${{{}}}""".format(property_, propertyID))
diff --git a/syncplay/ui/gui.py b/syncplay/ui/gui.py
index 298d512..17ac512 100755
--- a/syncplay/ui/gui.py
+++ b/syncplay/ui/gui.py
@@ -1575,6 +1575,7 @@ class MainWindow(QtWidgets.QMainWindow):
         data = event.mimeData()
         urls = data.urls()
         if urls and urls[0].scheme() == 'file':
+            url = event.mimeData().urls()[0]
             if isMacOS() and IsPySide:
                 dropfilepath = os.path.abspath(NSURL.URLWithString_(str(url.toString())).filePathURL().path())
             else: