Stefan, thanks for the reply. Unfortunately, I can't open the part file that you sent. I have both v25 and v26 running under Windows 7 Pro, but I don't know if Windows 7 is the problem, or not. Anyway, I take it that you were able to save a part to folder with a name starting with a number, which is interesting! I should have posted some of the script that I was trying to use. It came from the Quick Start tutorial from the Alibre website, and started and ended with:
MyPart = Part('SHCS 5mm x 20mm')
. . . . .
MyPart.Save("C:\Dave\3D CAD\Alibre Design Expert 25\Projects\Exercises\Parts")
which runs fine when I use . . . \D3 CAD\ . . . So I'm puzzled! Thanks for looking into it.