You're here because you have a file that has a file extension ending in .mpi. Files with the file extension .mpi can only be launched by certain applications. It's possible that .mpi files are data files rather than documents or media, which means they're not meant to be viewed at all.

The MPI File extension is a data file format, and files affixed with the .mpi extension are known as InstallJammer project files. This file format was developed by InstallJammer Team, and the associated software allows developers to create installer executables for their applications, and metadata details and actions for the corresponding installation executables are also stored. This software features a very powerful install builder with support for multiple themes and a high level of configurability for installers. It also features a virtual text panel which contains virtual text and virtual directory definitions for the project. Virtual text defines the variables used in the project. Project files are saved using plain text formatting specifications and can be stored in source control systems to create comparative data when collaborating with other developers. Installers are built as single executable files for easy distribution, and these installation executables handle everything the user needs for installing the applications via these simple, cross-platform installers. This software is used for making installation executables for applications developed to run in Microsoft Windows, Linux and Mac systems. The InstallJammer software is no longer in active development.

Launch a .mpi file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .mpi file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .mpi files aren't yet associated with it. In this case, when you try to open a .mpi file, you can tell Windows which application is the correct one for that file. From then on, opening a  .mpi file will open the correct application. Click here to fix .mpi file association errors

Be careful not to rename the extension on .mpi files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .mpi. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.