Yeah! I have discovered a way around this.
-First go to this thread: (shoot, this forum will not let me post a website address) so google: Ribbon for AutoCad Express Tools 2009, the first site is the one you want (Cadforum powered by Xanadu)
-Download the acetmain.zip file to your hard drive
-unzip the file
-in Autocad, type MENULOAD
-locate and select the acetmain.cui file that you just unziped
Voila! Express Menu is loaded!!!
Uh-oh, it seems that only some of the commands work...I guess this is because the zip file was for autocad 2009. Atleast it is a start...
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I did it this time!
There is no need to download the zip file I told you about.
-go to your folder location:
C:\Documents and Settings\[YOUR NAME]\Application Data\Autodesk\AutoCAD Mechanical 2010\R18.0\enu\Support
-you should see a file with the name acetmain.cuix
this is the file that you want to look for when you type MENULOAD
-if you don't see this file, I may have gotten it when I installed the express tools option through the autodesk Inventor Link - not sure
Everything looks great!