Apparently, we ship
libgst-python2.6.dll and some duplicate copies of the DLLs (that's because some get bundled by py2exe and others are copied by the BAT file..)
All this, as cleanly as possible... using (educated) trial and error might still be the fastest approach.
r2748 removes the python2.6 warning
r2776 removes the GStreamer plugins we don't need when building with sound - reduces the compressed installer output size by about 2MB (actual disk space used by much more - and more importantly, far less clutter)
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/265