>>The "Open With..." dialog indicates that something attempted to indirectly open the file - an API call to one of the ShellExecute()/ShellExecuteEx() family of players got invoked, possibly through an accidental click action in Explorer, firing Shell.Application's Open method, or launching an InternetExplorer.Application object's Navigate method are some of the things that could be the root cause.
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>So, you're saying it was probably just coincidence that it was a vfp TMP file. Could be, that's the first and only time I've seen it - with the ISO problems, I may be getting paranoid...BTW, I just made a related post over in the NT forum, to get your curiousity up :)

Yeppers; it's an OS dialog where something said "open this" to the OS, and the OS looked in the registry to see what tool was supposed to be used based on the file type, didn't find it, and said "With what?"