There are probably a multitude of ways to accomplish what you want, but one
of the easiest is something like this:
It's a bit sloppy in that it changes the "file open directory" without
warning the user, and of course, this change will stick until the next time
Word is restarted. However, this isn't much different from what Word does
natively - as you discovered when you said "it opens the last
directory/folder that used in Word".
Other methods are available, and there are ways to work around the
limitation of the above; e.g. recording the current "file open directory" in
a variable and resetting it afterwards. However, these methods might be a bit
more complicated and probably not worth the effort for a limited application.
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