Internet Explorer deletes temp file before programm can access it

Hello,

if a user loads a file associated with a special program and executes
it directly (IE6) the program is started with the path to the file in
"temporary Internet files" folder but the file is not there anymore.

I tranced with sysinternals filemon to get to this issue and saw that
ID sends a "delete" on the file even before the program is started.

This only happens on some of your servers, some work just fine.
The settings seem to be correct (auto search for new version, more
space setup than required). The server does not send any
expirationdates for the file, so this should be auto also.

How can this be? How does ID determine to delete a temp file?

I really hope someone can help me.

Regards,
Uwe.