Have you ever lost your AutoCAD open dialog box? When you save or open a drawing, you don’t get the file dialog box, only this question at dynamic input or command line:
I had this question several times. I never experience this, but it looks like this is a common issue. I found many similar thread in some AutoCAD forum. This thread is an example.
When AutoCAD ask us to open a file, either DWG file or other file type, we should see dialog box similar to this.
Enter name of drawing to open <.>: plan.dwg
Some of them said that the dialog box is missing after their computer hang or freeze. I suspect they were running some LISP or program when it happened. Or cancel poorly written LISP without error trapping.
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Somehow, an AutoCAD system variable has changed. To restore it is easy.
Type FILEDIA then [enter].Enter 1 as new value, then [enter].