Hi Michael,

The intent was just to not be able to overwrite the originally opened file. I open drawings a lot to copy objects from them or maybe get some dims, but when I'm finished, I dont want anything to have changed. One slip of the "File" button and 'oh dear', you just saved (being that 'Save' borders 'File').

Dang, I would have thought it would be easy (what the he77 do I know :-P) to code:

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if checkbox is ticked

then

msgbox ("Read-only mode")

else

business as usual

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Easy for me to say! Once again, Nick makes a goofy request. :-)