Mail Merge File Open Dialog - File Filter

In Access, when I use the 'Mail Merge Wizard' it opens a standard "File Open Dialog" box where the default "File Filter" only shows basic word documents by default. This default filter does not show Templates [.dot] or Macro Embedded Templates [.dotm] files -- forcing me to then select "All Files" on the file filter box to reveal my [.dotm] files. Is there any way to add templates such as [.dotm] files to the default file filter selection? It is a minor issue, but it would be nice to see my [.dotm] files by default instead of having to adjust the "File Filter" every time to "All Files" just to show the [.dotm] templates that I want to use for the merge.