Below is a procedure that we use to find everyone's temp folder.

PROCEDURE FindGlobalTempPath
* Find our home directory. It won't always be on the C: drive. This code is
* lifted from the July 2001 FoxTalk in the "Reusable Tools: Going Ape Over the
* Win32 API" article. Returns a path for temp file storage, either on the
* local machine, or on the Citrix server if citrix client.
IF TYPE("globalTempPath")="U".OR.TYPE("globalTempPath")="L"
PUBLIC globalTempPath
globalTempPath = SPACE( 260 )
DECLARE INTEGER GetTempPath in Win32API integer nLength, string @szBuffer
GetTempPath( 260, @globalTempPath )
globalTempPath = ADDBS( LEFT(globalTempPath, AT(CHR(0), globalTempPath) - 1))
CLEAR DLLS
ENDIF
ENDPROC

We just make sure to call the procedure in the beginning of our setup code and then any time we want to save to a temporary file we use the globalTempPath varaible for placement.