If you want to open an msg Email file with the extension .msg, Outlook

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Asked: May 10, 20262026-05-10T23:59:45+00:00 2026-05-10T23:59:45+00:00

If you want to open an msg Email file with the extension .msg, Outlook

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If you want to open an msg Email file with the extension .msg, Outlook 2003 will be started with some parameters. Therefore you can find the following registry keys:

HKEY_CLASSES_ROOT\msgfile\shell\Open\command\(standard) HKEY_CLASSES_ROOT\msgfile\shell\Open\command\command

The first one points to the ‘outlook.exe’ with the parameter /f ‘%1’. This starts Outlook with the information to open the mail. But the ‘command’ key has the following value:

%]gAVn-}f(ZXfeAR6.jiOUTLOOKFiles>ir@X7cr$%@u$}&V7{4p' /f '%1'

Can anybody tell me what exactly this is good for?

I’m writing an vsto Outlook Addin for which I need to modify these keys. In case I modify the ‘standard’ key, Outlook will be started normaly without using my alteration of the key. If I also modify the ‘command’ key Outlook does not even start anymore.

Only if I delete the ‘command’ key everything works fine as expected. But without knowing what the key is good for, this cannot be a solution.