Reference/GetTempFileName
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GetTempFileName
user_var(output) base_dir
Assign to the user variable $x, the name of a temporary file. The file will have been created, so you can then overwrite it with what you please. The name of the temporary file is guaranteed to be unique. If to want the temporary file to be created in another directory than the Windows temp directory, specify a base_dir. Delete the file when done with it.
GetTempFileName $0 File /oname=$0 something.dat # do something with something.dat Delete $0
Command introduced with NSIS v1.90
