AutoCAD 2010 :: Viewing MDT File

Not sure of the version of MDT files, but they won't export into Inventor 2011 so they are older than MDT 2009.

I have been trying to figure out why client cannot see objects drawn in MDT when opened in vanilla Acad.  I had him check what I believe is the main variable affecting this, proxy show, and it was set to 0.  After setting it to 1 and doing a regen, still nothing.

I also checked proxy graphics and proxy notice and they are both set to 1, but neither affect this issue directly.

I've had a few people check this file on their systems and they can see the objects.  Various O.S.'s were used to test the file, Win7/64 and 32, however the client who is having problems is using WinXP/32.  I am also able to open and see the object on another WinXP system.

Something else to note, I realize this isn't the correct way to use aectoacad, but I tried opening the file in vanilla Acad and used that export to acad command and guess what?  The client can see the object now!

I thought export to acad (aka aectoacad) was suppose to be used from what ever application the dwg first originated in?!?!  If it works this way then so be it!