June, In my experience, I feel that your best bet would be to use a Python script with ArcGIS. If you're not familiar with Python, you can always start with doing a simple model using Model Builder in ArcGIS, and use the export to Python feature. Python is somewhat self explanatory and you should be able to get what's going on in your script. Adding a "for" loop at the beginning should help you deal with your 20,000 files... I hope that helps, Cedric
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