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Repair has fixed it! Thanks again for all your help Cad64

What @eldon said. But first, run the LIST command and then select one of the polylines on which the command fails. Anything out of the ordinary about this polyline show up?

Thanks guys, i eventually found a very old program called halftoner where you just drag an image into the program and it converts it for you in a few seconds!

Attached is updated Lisp v5-2. The code now checks the lengths and total strings for any "." and replaces that with a "," using vl-string-subst. This will replace only the first occurance, and "There can be only One" (One of the best lines from "Highlander") Hope this is OK. MedZ v5-2.lsp

If the second example is desired, you could use my numinc:incrementalpha function which appears on lines 4,375-4,427 of my Incremental Numbering Suite application. For example: _$ (numinc:incrementalpha "15.QF9" 1) "15.QG0" _$ (numinc:incrementalpha "15.QF9" 10) "15.QG9" _$ (numinc:incrementalpha "15.QF9" 100) "15.QP9" _$ (numinc:incrementalpha "15.QF9" 1000) "15.UB9" That's very flattering of you to say Steven - though, we all stand on the shoulders of giants and were all a beginner once