Using DeleteUrlCacheEntry to delete a single file

I have a single file in the IE cache I want deleted. I am using
DeleteUrlCacheEntry to do so:

l& = DeleteUrlCacheEntry("C:\Documents and Settings\user\Local
Settings\Temporary Internet Files\file.cab")

I always get back an error of 2 indicating that the file cannot be found. If
I open Windows Explorer and view the path I see that the file is indeed
there. Is there another method to using this API other than the example I
show here? Is what I am doing not possible?

Thanks,

JW