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Back in the Win 3.1.1 days with its 8.3 character file name restrictions I used different extensions to divide up different sets of docs. This is a very great no no in the general computing world but in those days of very small computers with very few apps and no internet connection it worked quite well. Of course I knew how to determine what extensions were taken and how to associate an extension with an app so I never lost a file. So you father-in-law may not be so silly. Certainly no sillier then me!!
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