IE/Wininet cache breaks when it has lots of small files in it, is there any work

If you have your IE/Wininet cache set fairly large (600M or so), and you
access lots of tiny files, when the cache gets around 30000 files in it
but has not used up all of the disk space quota (nor filled in the
disk), it stops taking new files, and just fails to cache anything.

This bug seems to be fairly old, but still present in current versions
of IE/wininet.  Anyone know when they might fix this?  Is there any work
around inside of a program aside from just using
FindFirstUrlCacheGroup/FindNextUrlCacheGroup/DeleteUrlCacheGroup when
you suspect that it is broken, or just setting the cache to something
small (I have seen the bug with as little as 380M, but it seems to vary
with the machine, and maybe the exact URLs being used), or telling your
users that MSC has a bug, and that they should clear the cache manually?

Thanks.
William Bardwell