.IMOVIEMOBILE File Extension
What is an IMOVIEMOBILE file?
Project file created and used by the mobile version of iMovie, a video editing application for iOS; contains an iMovie project, similar to the .RCPROJECT file; includes the project timeline, effects, transitions, audio tracks, and other project settings.
If you do not have an iOS device or a machine running OS X to open your IMOVIEMOBILE file, you can still access its contents. First, copy the IMOVIEMOBILE file, rename the file extension to "zip", decompress the file, and the project content will be in a folder called "Assets." You can then open the original content in a video editing program.