Back in May, I had written that Autodesk files should be explicitly excluded from virus scan - in an effort to speed up opening (and auto-saving).

HOWEVER! Tom Stone brought to my attention that there is a rare, but existant peice of code acad.vlx that can make for a bad day. Read through some of the comments before firing the fix for this.

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Excluding ACAD files from Anti-Virus Scanners may increase the end drafters efficiency.

The files types most often opened are .dwg, .bak, .dst (sheet control) and .rvt for Revit users. These files have tended to become quite dense as the application becomes more complex (with new versions annually!).

Excluding the files CAN leave you open to possible (but extremely rare) viral attacks - the last, ACAD.Star, having been reported in July 2000. Having server or router resident Antivirus tools can (or should) intercept any possible new threat.