It looks like the Official 3DR CAD files are corrupt.  I might be doing something wrong, but I'm a fairly experienced CAD user, and I've tried to be thorough.  I have access to a CNC laser cutter, and I decided to cut my own Arducopter frame.  I tried multiple approaches to open the files (as listed below).  

Every single one of the files seems to be corrupt.  Can anyone help me to:

1. Get working copies of the Arducopter and Hexacopter frame CAD files
2. If the problem is on my end, let me know what I did wrong
3. Bonus question: what CAD software and version are the 3DR designers using?

What I did that resulted in the errors:

1. Downloaded all current versions of CAD files from link below.  Some were DXFs, some were Solidworks files.
2. The official 3DR Arducopter and Hexacopter frames CAD files are located here: https://github.com/3drobotics/3D-Robotics-Products/tree/master/3D%2...
3. Tried to open all files in Solidworks 2011, Solidworks 2012, AutoDesk TrueView 2013 and LibreCAD.  I tried each of these on two separate PCs.
4. Every time I tried to open a file with Solidworks, I got an error (see images below).  LibreCAD didn't articulate an error, but it also couldn't open any of the DXF files.  TrueView simply freezes when I try to open the DXFs.

Thanks!

-Jeremy