The extension MSWMM marks files of Microsoft Windows Movie Maker, a video editor program. This program is either Windows free or can be downloaded as part of Windows Live Suite.
The MSWMM files contain video clips, transitions, pictures, the timeline, and audio data that are combined into a movie. The data contained in the MSWMM file can be edited and edited using Windows Movie Maker or Windows Live Movie Maker. To be able to use the video in general, however, the data must be exported to a format such as wvm or avi.
Most often resolving problems with opening MSWMM files is very simple. Just install an appropriate program that supports such files. All of the listed programs support MSWMM files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of MSWMM files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate MSWMM files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Windows Movie Maker applications is not on the list, select "Browse" option in order to manually locate the directory where Windows Movie Maker has been installed.
Sometimes problems with opening MSWMM files may not lie with the application itself, but can arise due to other causes, such as: