VAX file format conversion

[Mouse]

> $@hobbyist-use-only-va.txt
> %RMS-W-RTB 512 bye record to large for user buffer

The little grey cells holding this info are rather dusty, but they're
telling me that back when I used VMS (early '80s) CONVERT/FDL was the
appropriate tool to deal with issues like this.

It took some noodling around the HELP pages and some experiments, but I
eventually got the file I was dealing with converted.  You might want
to throw ANALYZE/FDL at the file first to see how it really is set up.

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