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How to stop the latest Mathematica hijacking the .nb extension in

• To: mathgroup at smc.vnet.net
• Subject: [mg95266] How to stop the latest Mathematica hijacking the .nb extension in
• From: Antti Penttilä@smc.vnet.net
• Date: Tue, 13 Jan 2009 07:03:49 -0500 (EST)
• Organization: University of Helsinki

Hi,

Has anyone had a similar problem: The latest (V7 in this case) 
Mathematica installation seems to hijack the file association to .nb 
files to itself. This is usually what the user wants, but in some cases 
(if the latest version has severe bugs etc.) it would be nice to open 
the notebooks with previous version (in V6 in this case) when 
double-clicking in Explorer.

Usually one could just edit or remove the file association in 
Tools->Folder Options->File Types with Windows Explorer, but Mathematica 
seems to use some trick that always opens with the latest, even if you 
try to change the association.

Has anybody found a workaround to this? The problem seems to exists at 
least with XP and Vista.

Cheers,
Antti