Hello,
I too have Mech 2004 & 2005...
I tried to open your drawing and I got the same error's as you.
I tried to run Recover on it, I tried to insert it as a block, and I even tried to access it via Design Center but It crashed there as well.
It's funny that prior to loading the file, I can see a Thumbnail image of it but it will not load.
Possible Help:
You should have a backup of this file, right? Look for a EL-F.bak or EL-F.sv$ file. Change the extension to DWG and see if you can open it.
If that does not work, try accessing your AutoCAD subscription service (if you have one) and tell them what's going on -- maybe they can help.
What version of AutoCAD are you saving to?
Regards,
Joey Steed