After hours of painful experimentation (wasted my whole Saturday on it), I
finally learned that Application.FileSearch's .FileType "kind of" takes care
of my question, for anyone else needing to know. If you write .FileType as
one of your Application.FileSearch criteria then type a space and equal sign,
it intellisenses a bunch of options.
Above I said "kind of" because MS claims that the msoFileTypeOfficeFiles
option will return .htm and .html files, but it doesn't--maybe it will if
it's an HTML page created in Word, I don't know, but I found that it didn't
pick up a regular old HTML page created in Notepad. So, in my macro, I just
set up a variable that parses the file extension; and if it's one of the
standard Office extensions, set the variable equal to msoFileTypeOfficeFiles
and msoFileTypeAllFiles for all others (got an error when I tried to used
quotation marks).
Now I have another question about returning the folder for the file found,
but I'll do that in a different post. Since the excited answer for this one
ran a little long, the question might get buried and never answered.