I have been having tremendous problems using this codec pack with Media Player classic. Possibly the cause of the problem is the use of a product called XPlite that provides extra options to remove unwanted windows components. It is possible that media players or their codecs were not completely uninstalled. What happens is that wmv9 and wma9 will not open. When you re-install the codec pack the following two codecs are shown as remaining uninstalled:
Windows Media MPEG 4 v1.1 Direct Show
WM Audio Voice 9
Sherlock shows the following codecs as broken or missing:
Indeo video 5.10 Compression Filter
Indeo Video 5.10 Decompression Filter
Windows Media Video Decoder
The only answer is to open a media file in the WMP 6.4 that came with the OS and it will automatically download the required codecs. The two files downloaded were:
WMPK Dshow Voice Decoder Cab for 6.4 Player (RTW)
WMV-9 VCM RTW
I have not been able to find where you can download these files to save on a disc.
Incidentaly Media Player Classic does have a find codec button but the page you are referred to is full of programmers gibberish.