ESP3, Easy Sketch Pro 3.0 Project File (.esp3)
The ESP3 Video file format
ESP3 files are most commonly associated with Easy Sketch Pro, a doodling and sketching software. The program allows users to create animated videos in a sketched or doodled style. The ESP3 file was introduced with the 3.0 version of the program. It is used to store the work in progress of a project created in the video editing program.
Technical details of ESP3 files
Since ESP3 files are merely project files, they do not contain the actual visual or audio data used in the project. It does, however, contain links to the files used in the video project as well as all kinds of effects and cuts.