A file with the GEN extension is a game ROM used by Sega Genesis/Megadrive emulators. It saves a copy of the contents of an original game cartridge and allows the game to be played on a PC with supporting emulation software. The GEN file extension is interchangeable with SMD and BIN, also used for Sega Genesis ROM.

The .gen file extension is primarily used by the ArcView software. This file extension is implemented for files that can be exported with the use of the Arcview program. This software is an application that is used for analyzing data related to geography. It is mostly used for creating digital maps of specific locations and for printing out these maps. Geographic information exported from the software is saved in files with the .gen extension. It is the .gen file extension that allows Arcview to display all data relevant to the corresponding location that was mapped out using this program, whether they are geographical data or other map details. Arcview is not the only application that use the .gen file extension.  This file format is also implemented by Ages!, which is a genealogical software that is used to organize and track family history, and these GEN files in Ages! are used to store details and pieces of information entered by a user in a family tree database created using this program. Ventura Publisher, now known as Corel Ventura 10 as of this writing, is also an application that is implemented with support for these GEN files, though for purposes that are different from these two programs.

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