<p>Thank you for all responses.  Since my last post, I did look at the source code and found out that all those file type are, in fact, hardcoded into the system, so there is no way to remove them other than edit and rebuild the source.   LarsGit233 summarizes the search process I went throught quite well.<br>
Sorry I didn't post my disappointment earlier.   Scrolling through 30 types when you only use 5 is an unacceptable solution.</p>

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