MacOSX – File extension associate with application – Programmatically

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To register a new file extension with an application use the following defaults command.
Replace PUT_FILE_EXTENSION_HERE_WITHOUT_PERIOD with the file extension i.e. txt.
Replace org.category.program with the com/org name of your program i.e. com.apple.itunes.

$ defaults write com.apple.LaunchServices LSHandlers -array-add \
"<dict><key>LSHandlerContentTag</key>
<string>PUT_FILE_EXTENSION_HERE_WITHOUT_PERIOD</string><key>LSHandlerContentTagClass</key>
<string>public.filename-extension</string><key>LSHandlerRoleAll</key>
<string>org.category.program</string></dict>"

Once you have added the file extension to the launch services, you must restart the launch services deamon so it will re-read the configuration file.

You can either run the command below to restart launch services, or simply restart your computer. Loging in/loging out also might do it but I haven’t tried.

$ /System/Library/Frameworks/CoreServices.framework/Versions/A/Framework/LaunchServices.framework/Versions/A/Support/lsregister -kill -domain local -domain system -domain user

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