WordPress by default only allows 2 meg uploads and only of particular file types. (eschipul.com)
The Regulatory Audits tend to only be reactive against a Managing Broker, when the number of actual violations (ratio to files examined) reach an unacceptable number — but then again, this can come down to which particular files happen to be examined. (remonline.com)
Whenever you use any program to open such a file, it gets added to this list, as Windows 8 / 7 or Windows Vista remembers that you had used it once; if you were UNABLE to use it for opening that particular file type. (thewindowsclub.com)