Running on IIS6 (importer.php problems)

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Just downloaded and installed C5 on an IIS6 system, and it's running great. Problem, though, with file imports (images, etc.).

This is NOT related to file types, (they're all set up), but instead appears to be related to the temporary storage directory on the IIS6 host when importing files.

The temporary filename (path & name) reported by importer.php is (example):

C:WINDOWSTempphp8F8.tmp

all backslashes are stripped, and I'm not certain that write access to the system temporary directory will make our hosting company very happy.

Anybody have any idea about the best workaround, and where to start?