IMOVIEPROJ is an extension given to files that are used by the program for creating video projects called Apple iMovie. IMOVIEPROJ files allow you to store footage based on a timeline, which can contain video, audio, information about effects, subtitles, etc. in the appropriate places. The IMOVIEPROJ project contains all the multimedia data that will be added to it and sometimes it causes, that it has a considerable size, even in the order of several GB.

The Apple iMovie program works under the control of Apple operating systems, therefore the IMOVIEPROJ files can most often be found in these systems.