Large .tmp files in C:\Windows\Temp

Question

I have a Windows 2008 server which functions as a web service server, and every other week or so, the C:\Windows\Temp folder is filled with large (between 40-300 meg) files with names like: ~DF5D73.tmp, ~DFA95.tmp, etc. They appear

My webservices on the server don't create any files with that type of name, and the contents don't appear to help identify them. Process Explorer indicates that w3wp.exe is currently using several of the files, but I can't imagine specifically where they're coming from.

As an example, the top of one of the files is:

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The owner of the file is only identified as localname\Administrators, so that's no help. Anyone else experienced a similar issue or any suggestions to track where the files are coming from?