I've been using CCleaner for awhile and I've always noticed this bug/problem but just registered onto the forum today so I'm reporting it now.
The version of CCleaner that I'm currently using is: 1.37.456 (but as I mentioned, I've noticed this issue with the older versions that I've used as well).
On my 2 computers (one running Windows 2000 SP4 and the other running Windows XP SP2), not all the Windows TEMP Folder Files are deleted after 48 hours even though this is the option that I selected in "Options", "Advanced".
I noticed that executable files (specifically .EXE) are not deleted as well as some other files (maybe .JPG files also) even though these files are older than 48 hours and have not been accessed in over 48 hours. All my other files in the Windows TEMP folder are deleted (after 48 hours as they should be) such as .TXT, etc.
Jim