[Joel]

In the case of the info.plist files that are found within OmniGraffle file packages, they can not be deleted as they are the backbone of the file itself -- without them, the file is nothing.

I'd hedge a bet that DiskWarrior thinks they are "corrupt" simply because they're slightly modified in order to make the file format work.

If you like, you can save out your OmniGraffle files as "flat", which will avoid this situation neatly -- That particular control is found in the Document Inspector.