I have made and installation for Media Player Classic 6.4.8.2 which support silent installation...

This install create program group, and association MPC with these files extensions :
AAC/AC3/AVI/BIK/DTS/LPCM/M1V/MPG/MPEG/MKA/MKV/MP4/OGM/SMK ... more will come if you ask...

Actually it is only in French, but if I have some requests for a US version I'll made it.

Here is the link : http://mei.planet-d.net/mpc/mpc_6482a_fr_2kxp.exe

Media Player Classic doesnt need any installation at all. and associating video files, for example, is done by
mplayerc.exe /regvid

I don't known this switch...

But for me it's easier, because I wanted to create shortcut and that I'm using a French Windows... So I prefer have associations described in French.