what is a .msi file
Installer package (Microsoft Windows) MSI is an installer package file format used by Windows. Its name comes from the programâs original title, Microsoft Installer, which has since changed to Windows Installer. MSI files are used for installation, storage, and removal of programs. The files are contained in a package, which is used with the programâs client-side installer service, an .EXE file, to open and install the program.