The format that CHDK output is definitely different from both CRW and CR2.
However, dcraw-based software can read it fine.
I have no clue about codecs that can integrated with the Windows shell, though.
I'm currently working on making CHDK output standard CRW files (and/or DNG), but while I have the framework ready and a superficial but usable knowledge of the format, I think it will take a little time.
a sort of of dng4ps2 but without raw to dng conversion.
DNG is a raw format, which contains the same data (except for badpixel interpolation) as a CHDK CRW.
I might take a little time though to go back to their website and see if they have a features request input
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