[AnalogKid]

I don't understand you.
What ik mean is, the file name can give a lot of info e.g. "HDMovie2.2008.1080p.BluRay.DTS.x264", this in combination with an actual Media read (like de tool MediaInfo) can give a complete summary.

OK, here is how it works.....

XBMC can deduce MOST of the information from the actual video file... i.e. the resolution, the codec, the audio type etc. Instead of reading this from the fileNAME (or folder name), it gets it right from the video file... the RIGHT way to do it.

However, it's impossible for XBMC to know the 'source' of the video (i.e. where it was ripped from). A movie at say 576x480 might have actually come from a DVD, a TV recording, even a blu-ray disc (downscaled) or from Youtube (upscaled). For this reason, XBMC is FORCED to get the info from the filename.
(There is an argument that XBMC could take an accurate guess, and make some assumptions on the possible source... but for the moment, it likes to work with facts rather than supposition!).

Please note also, that this is a relatively new feature of XBMC. For a long time, XBMC couldnt read the info directly from the file, so read all info from the filename. This is why some users who've been away for a while get confused.