I have tested amulegui cvs 20080218 and I can't preview partfiles on windows, vlc says:
Unable to open ''X:\Temp\077.part''
Messages window says:
main error: no suitable access module for `'X:\Temp\077.part''
X:\ is my smb share and I can preview it clicking on file directly
Maybe it is sent quoted to vlc like this? (I checked and vlc don't allow that and return same errors)
'X:\Temp\077.part'