I have a DLL that I am writing that will be used from our web site. Within this DLL I must change the user that the code is running under so that I have access to several unmanaged API's, WMI, Registry read/write access, and creation and update of a number of files. The user that I am changing to is in a group (NOT an administator) that has the rights assigned in the group policy that I need. Changing to the user using the LoginUser API and setting the WindowsIndenity is fairly trival (once you know what needs to be done!).

The problem that I am currently struggling with is that a number of temporary files need to be created. When the call IO.Path.GetTempFileName is made an exception of "Invalid Directory Name" is thrown. I suppect that the problem is security related as when during debugging I attempt to see the Environment.SpecialFolders.ApplicationData directory it returns an empty string. Can anyone give me a pointer to what I need to do to continue forward?

TIA

David