Wes,
That's got it. On Windows, right-click the file and tick the Read-Only Check Box.
Thanks.
But could ArchiCAD do this for me? Microsoft Office does.
Think Like a Spec Writer
MacBook M4Pro - 24Gb RAM
AC4.55 through 30 / AC29.2.1 COLLABORATE AC30.0.0 COLLABORATE
Rhino 8.36 Mac
MacOS Tahoe 26.6.2