Hi Michael,

> I've always treated either .stp or .step as interchangable just indicating
> it's a STEP file and not necessarily the specific sub type, similar to .jpg/.jpeg or .igs/.iges .

I thought so too until I couldn't see a STEP file when opening in NX with the extension .step, I had to change it to AP 214 in the file type drop down list for me to see it and open.

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