Exporting compressed files

[Andrew Parsloe]

I inadvertently tried exporting a compressed 2.2 file to 2.1.4. It was 
not recognised by 2.1.4. When I try exporting an empty 2.2 compressed 
file, it too isn't recognized by 2.1.4, so clearly this is not an 
allowed mode of export. However I can't see anything saying that this 
won't work in the documentation, and I wonder if it *should* be possible 
-- uncompress in the background and then export that? (I have a number 
of older files saved in compressed format which I'm looking at in 2.2 
and saving, but also exporting to 2.1 format to retain a copy I can work 
on in 2.1.4.)

Andrew
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