How can I enable Vista to recognize filenames that have no extension as
WordPerfect files?

Has anyone out there been able to make Vista associate un-extensioned
filenames with *any* particular application?

Brian

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Background:

XP allows it. One of the Vista Betas allowed it.

I name my WordPerfect documents without file extensions, e.g. "122046"

From within WordPerfect, if I ask WordPerfect to use nothing as the default
file extension for WordPerfect documents, WordPerfect displays an error
dialog stating that although you *can* set WordPerfect to do so, Vista will
not recognize such non-extensioned filenames as WordPerfect files, which is
true. (The resulting icon for a WP file looks like a blank piece of paper.)

I know there are some system files without extensions, but I keep my WP
document files segregated, so under XP (and under that Vista Beta), when I
saw a non-extensioned filename with a WP icon, and it wasn't where my WP
files lived, and it wasn't named using my WP-document naming convention
(6-digit numbers), then I immediately knew that it was a system or other
file. (And I saw very few of those files.)

Thanks for any and all pointers.