Hi,
I would like to suggest adding Move Network's video player to one of the supported applications. This is a very popular video player, and is used (under the skin) by abc.com, disney.com, espn.com, discovery channel, CW, and others.
The cached video "quantums" are stored at
C:\Documents and Settings\%USERNAME%\Application Data\Move Networks\QMCache00\*.*
If you replace %USERNAME% with your username, you can add this string to CCleaner's Options' "Include" section. By manually adding this string to CCleaner, CCleaner will clean the Move Network's cache.
I don't know if CCleaner allows environment variable expansion within its path strings, so you may need to replace %USERNAME% with the actual user name manually.
Move Networks caches ~ 80 mb of data for each user when viewing HD video streams from abc.com