I can read it in bsplayer 2 pro
demultiplexer : elecard
video decoder : sonic cinemaster

what am I supposed to do now to fix it?

- Install a good MPEG2/DVD playback software or codec.
- Perhaps uninstall the codec packs
- Install Graphedit to check which codecs are used for This file's playback. You may also check it with Gspot

This is an MPEG format video file. This format is not currently supported by GSpot. Codecpack from www.codecpack.com isn't good enough???
And why other applications can open the file?

Codec packs in general are not good (since you read the Help2Help topic you should have also read the "stay away from codec-packs" sentence at beginning of section (4))..

I don't suggest you to install a codec pack, but if you want to use a codec pack, then maybe try K-Lite one, and use the "Playback only" settings. (Then in "DirectShow: Source Filters" choose Gabest for MP4 and Matroska splitter, OggDS for Ogg splitters, and Elecard MPEG Demuxer.. never had any problem with those settings)

But i still suggest you to install only the codecs you really need

The latest version of Gspot supports MPEG : http://www.headbands.com/gspot/

Iy plays OK. But is an MPEG 2 file. Not MPEG, and to play it it BSPlayer you need an MPEG2 decoder, as I've stated above.

I've downloaded http://alfa.icis.pcz.pl/~subedit/pol...decpack_pl.exe and works fine. STRANGE :? without that installation BSplayer doesn't open the file but other applications (Windows Media Player, VLC Media Player, Media Player Classic) could open the file ;)

Those other players have internal codecs so they're able to play some files without external codecs. Sometime it's an advantage, sometimes not..