[HELP]subtitle problem... did a search but...

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Hi guys,

first of all, A2 is kicking some serious butts in the office...

second, I did a search regarding to the subtitle ripping and editing... and actually I am kind of stucked...

here is my problem:
well, I got lots movies and subtitles but lots of the subtitles contain [.idx+.sub], which is playing perfectly on my desktop and my laptop...

I tried to convert them into .smi (sami) with vobsub and subtitle workshop or some other subtitle editing software but no lock...

as for subtitle workshop the error message I got was "bad subtitle"... but I am 120% sure the subtitle is fine...

Can anyone help?

Thanks a bunch in advance!