How to regain warnings about permanent version storage?

Question

With Preview in Mountain Lion, I carelessly checked the box –

[√] Do not show this message again

– imagining that the preference was for just one volume.

Then realised that the warning (the sheet):

• no longer appears for Preview, with other volumes that do not support permanent version storage
• continues to appear for apps other than Preview, with the volume where I don't require the warning.

In other words, I imagined wrong. The preference may be app-specific, not volume-specific.

Please:

• how do I regain the warnings in Preview?

Already I sped through ~/Library/Preferences sorted by modification date, and opened a few files including com.apple.finder.plist but at a glance:

• I can't find any .plist with content that includes the string revision

If the preference is elsewhere in com.apple.finder.plist: where?

(I'd prefer to not abandon that file – it's 35 KB with 3,417 lines.)

Also I viewed the content of recently modified .plist files relating to Preview. Unless I'm missing something, nothing relating to revisions, versions or storage. com.apple.Preview.plist is not recently modified –

– and within those nine, the two that are recently modified seem to contain nothing relating to permanent version storage:

Any other ideas on how to correct my mistake? – Thanks

Answer 1

For apps that are not sandboxed

Example:

To regain warnings about permanent version storage for Apple Pages

Quit the app, then a one-line command in Terminal:

defaults write ~/Library/Preferences/com.apple.Pages NSDocumentSuppressTempVersionStoreWarning -int 0

– in the Preferences area that's familiar to users of Snow Leopard and less.

For apps that are sandboxed

The operating system uses a different approach to containment of some preferences:

~/Library/Containers/<bundle_id>/Data/Library/Preferences

Example:

To regain warnings about permanent version storage for Apple Preview

Quit the app, then a one-line command in Terminal:

defaults write ~/Library/Containers/com.apple.Preview/Data/Library/Preferences/com.apple.Preview NSDocumentSuppressTempVersionStoreWarning -int 0

Thoughts

I should have thought first of ~/Library/Containers when, in the question, I observed –

com.apple.Preview.plist is not recently modified

– but I didn't realise what was going on until after I used fseventer to visualise writes for a different user of the OS.

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References

App Sandbox Design Guide: Migrating an App to a Sandbox

A visual record of me finding the relevant key in the .plist for Pages

A visual record of me finding the relevant key in the .plist for Preview