BUG
** This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1) **
Exporting a large map layout at high resolution to TIFF, PNG, GIF, or JPEG causes a temporary file to be written to the TEMP directory. When the target export format is one of the above raster formats, the .tmp file fails to get deleted when the export is finished.
This is a known issue.
Note: This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1).
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