odg files not uploadable

When I went to Create Content, I tried to upload the ooDraw file (.odg), but the message I received said that the extension was not approved. Other od? files are allowed. Can someone shed light on what is and is not allowed and why? I ended up zipping the odg file and uploading the zip. Is that appropriate?

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ODG files

Oddly enough, .odg was not in the extensions, although I could have sworn it was there before the upgrade. I've added it, and so now you shouldn't have a problem. However, zipping up files is perfectly fine too.

all my best,
dj