If you have a CUI file that you would like to convert back to an MNU file, download cuitomnu.vlx.
( alternative download URL )
Disclaimer: This routine works on some CUI files, but not all. I tried converting the stock OOTB "acad.cui" from AutoCAD 2007, and it failed. I tried converting a custom CUI and the Express Tools CUI from AutoCAD 2007, and it worked OK.
Posted 9/29/2007 03:06:00 PM