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PIF files are Program Information Files and are used in all versions of Microsoft Windows to associate working directory, command line arguments, an icon and virtual machine parameters (XMS/EMS/DPMI memory settings, etc) with non-Windows applications.

Windows versions 95 also have .lnk files, which are poor excuses for symlinks, and are "stripped-down" PIFs which contain not much more than the command-line to start the program and which icon Windows is to use to display it.