I have an NSDocument based app that supports two file types, one as an Editor (for the new app version's documents) role and one as a Viewer (for old app version documents). Both are based on the same document class which reads both but saves only the new version format.

When -saveDocument: gets called on an old-version document, the framework completely ignores that by role definition (Viewer), it can't save the format and calls -saveToURL:ofType:::: with the old URL (wrong file extension) and old type (can't save that).

I find it a little odd that something like this hasn't been sorted out long ago, so naturally I'm wondering once more today, what am I doing wrong?

Regards
Markus
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Markus Spoettl
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