.sub + .idx = vobsub
bsplayer can't handle vobsub subtitles; you need directVobsub to display them (now known as VSFilter)
VSFilter download page
to install it: extract VSFilter.dll to c:\windows\system32\
register the dll to the system: start->run->
Code:
regsvr32.exe vsfilter.dll
it should load automatically when needed (provided subs files have same name as avi file) [to be honest, I did not myself test releases further than 2.23 with further than bsplayer 0.86.501...]
if you want to configure vsfilter at any time (not only when it is loaded by bsplayer or whatever player), you may create a shortcut with the following target:
Code:
C:\WINDOWS\system32\rundll32.exe vsfilter.dll,DirectVobSub