There is only one file type that uses the .XOJO_MENU extension:
Xojo Menu File
Menu file created by Xojo, an IDE used to create custom applications for Windows, OS X, and Linux platforms; replaced the .RBM file extension; used to share a menu bar in the Xojo project (text) format; includes other menu bar information, such as menus, behaviors, items, and platform-specific shortcuts.
Xojo projects can be saved in three different formats: Project (text), Binary, and XML. The selected format dictates the menu format. If you do not have a product license, you will only be able to save in the binary format, which closely resembles the old Real Studio binary format.
To create a XOJO_MENU file, click the tab of the menu bar you wanted to export, select File → Export [menu bar name]..., choose the save location, name the file, and click Save.
To import the XOJO_MENU file, select File → Import, navigate to your file location, and click Import.
NOTE: REAL Software Real Studio became Xojo, Inc. Xojo in 2013.
Updated: September 12, 2014