Inherited environment. Has the SMS_def.mof been modified?

I need to upgrade SCCM 2007 R2 SP1 to SP2 for an environment that I recently inherited. The environment has 2 primary (extra one for failover only) and 15 secondary servers all on the same R2 SP1.
The upgrade to SP2 replaces the SMS_def.mof and I do not know whether or not the SMS_def.mof has been modified.
 
First task is to find out whether or not it has been modified.
I am considering the DOS comp command for my SMS_def.mof with an "out the box) SMS_def.mof. I would add the .txt extension. First I need to find a default (out the box) SMS_def.mof to compare to. I was thinking the secondary servers would have it because changes aren't populated there.
 
Is there any reason the DOS comp command would produce false results? Is the DOS comp command a terrible idea?
 
If the file has been modified, my second task would be to find the changes.
Other than manually going through each line I am trying to find an easy way to identify the changes. I found  that "Beyond Compare" works. Does anybody have another option / idea?

Do you still have the installation media for SCCM SP1?  the default mof files will be on the installation media for sp1.
 
No better ideas for comparing:  either visually as you've noticed or if you found that beyond compare does a good job; that's good.

I had to do this just today.  Thought I'd share it in case it helps:
 
http://myitforum.com/myitforumwp/2012/02/10/how-to-quickly-view-what-changes-have-been-made-to-your-mof-files/

Oo that sounds cool I was going to suggest windiff