This doesn't seem to be referenced in any of the VBA Help files  or
at MSDN.

I didn't have one of the VBA Help files ("can't't find
veenui3.hlp"), but I Googled and finally found  it as well as some
others with much more from a Yale site. I must open them manually,
but whatever works...

I now have references for many file  methods (Open...Close)I info.