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The Jet engine needs to create temporary files. To create the temporary files, the Jet engine uses the TEMP and TMP system environment variables. If the TEMP and TMP system environment variables do not exist, Jet uses the %WINDIR% folder. If the SQL Server service account does not have permissions to create, write, delete and read files in the %WINDIR% folder, or to the folder pointed to by the TEMP or TMP system environment variable, the error occurs.