TextEdit is the default application for my Numbers documents

Question

Although I did not set it to be, TextEdit is the default application for my Numbers documents. It was not always this way, but it is now, and I can't seem to change the default application back to Numbers ('09). For example, when I double-click any .numbers document, I always get the following error message:
The document “xxxxx.numbers” could not be opened. The file isn’t in the correct format. The file might be corrupted, truncated, or in an unexpected format.
See: http://screencast.com/t/P5OSAJAq
Therefore, whenever I want to open a.numbers document, I must drag it to the Numbers application icon or right-click and select “open with” and select Numbers from the list of applications. Although this works fine, it creates a couple of extra steps that I would prefer not to do
My first inclination was to “Get info” and change the “open with”  back to Numbers for all .numbers documents.
http://screencast.com/t/TMJwBmTOkHN
http://screencast.com/t/LAnPsbeGdB
However, selecting Numbers as the default application will not persist after clicking  “change all.” Rather, it reverts back to TextEdit. Tony, this is the only way I know how to select the default application for a document type.
Is there another location where I can set/reset the default application?
Thanks!

Answer 1

I guess that there is at least one database used by the Operating System which is corrupted.
Run a maintenance application : MAINTENANCE is a free very good one available thru :
www.titanium.free.fr/
and ask it to repair permissions,
delete caches
repair database Launch Services.
Yvan KOENIG (VALLAURIS, France) jeudi 26 mai 2011 15:51:58
iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.7
Please : Search for questions similar to your own before submitting them to the community
To be the AW6 successor, iWork MUST integrate a TRUE DB, not a list organizer !