First, WMF (Windows Metadata Files) can be attached to documents, including pictures, but... they cannot and will not affect a Mac. Not ever. They're executables and the UNIX base of OS X reads them as text only.
Second, there is no such thing as a "virus" for OS X, and there has never been OS X malware that's ever seen widespread deployment.
There may be something in the files that's causing it, but the odds are astronomical that it could have, or has, infected your systems.
What Mike M says. If your files are damaged, I'd start troubleshooting your hardware, starting with the HD and the RAM.
I understand what you say about macs and viruses ( this is why we use them in the labs). The thing that is interesting is that once the problem file is opened, the printing from Photoshop is screwed on that machine until the prefs are trashed. Preview and other apps can print the problem file fine, it is only PS that is messed up. It appears to be something about the way printing prefs are saved in the image file which are then transfered to the PS app when printing.
Most likely there's metadata that could have been corrupted in RAW or later in processing of it, but I'd hardly call that an infection. It's more like if you save a JPG as a PDF and then EVERYTHING afterward defaults to PDF as a "Save as" until you trash the prefs.
If other files don't cause it, it's just this one. If more and more are doing it, you may need to reinstall.