Example
<key>CFBundleDocumentTypes</key>
<array>
<dict>
<key>CFBundleTypeIconFile</key>
<string>Icon file for associated file</string>
<key>CFBundleTypeName</key>
<string>My file format</string>
<key>CFBundleTypeRole</key>
<string>Viewer</string> <!-- The value can be Editor, Viewer, Shell, or None. This key is required. -->
<key>LSItemContentTypes</key>
<array>
<string>UTI of the file</string> <!-- Existing UTI or create a UTI for your new file type -->
</array>
<key>LSHandlerRank</key>
<string>Owner</string>
</dict>
</array>
source
