[winswitch] GStreamer can't find audio modules on Windows 10

[Philip Loewen]

I'm trying to start an Xpra client on Windows 10 using th script pasted 
below. A window pops open and emits many warnings before showing the 
desired X windows from the faraway server. Here is a sample -- there are 
many lines like this, all with the same string up to the first colon:

(Xpra_Audio.exe:4592): GStreamer-WARNING **: 18:31:49.750: Failed to 
load plugin 'C:\Program Files\Xpra\lib\gstreamer-1.0\libgstisomp4.dll': 
'C:\Program Files\Xpra\lib\gstreamer-1.0\libgstisomp4.dll': The 
specified module could not be found. (Xpra_Audio.exe:4592): 
GStreamer-WARNING **: 18:31:49.757: Failed to load plugin 'C:\Program 
Files\Xpra\lib\gstreamer-1.0\libgstlame.dll': 'C:\Program 
Files\Xpra\lib\gstreamer-1.0\libgstlame.dll': The specified module could 
not be found. (Xpra_Audio.exe:4592): GStreamer-WARNING **: 18:31:49.772: 
Failed to load plugin 'C:\Program 
Files\Xpra\lib\gstreamer-1.0\libgstmatroska.dll': 'C:\Program 
Files\Xpra\lib\gstreamer-1.0\libgstmatroska.dll': The specified module 
could not be found.      

The paths shown in the warnings above all lead to existent nonempty files.

I would like to solve whatever problem triggers these warnings. Does 
anyone here know how? (I have not used Windows much since the last 
millenium.)

Here is the batch file I am using:

@ECHO OFF set "PATH=C:\Program Files\Xpra;%PATH%" Xpra_cmd ^ 
--encoding=rgb ^ --opengl=no ^ attach ssh://my@secrets.here/173

Many thanks, Philip