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I mean Xara wouldn't, officially we only support the latest version. If something is up in an older version its not going to change or get fixed.

Ah, in which case go to Utilities > Options > Backups and turn the "backup open documents on program close and restore on program start" option off.

This will be likely that we introduced a tag that is used in version 12 onwards. As Xara scans the document you open and finds a tag it doesn't recognize, it'll throw up the made in a newer version...