It may be a Garry's Mod (Gmod) map file. Gmod players often download .rar files containing "keys" or "content packs" to prevent "Missing Texture" errors when loading specific European-style maps.
This translates to "Alternay Station." While there is no major real-world "Alternay" station in France, it is a common name used in fictional French railway modeling and virtual simulation maps. Download Cles Gare d'Alternay rar
If you are preparing a feature on this specific download, you should focus on: It may be a Garry's Mod (Gmod) map file
Does the .rar file include the "clés" (assets/textures) needed for other maps, or is it a standalone station? standard for distributing large mods
This indicates a compressed archive file, standard for distributing large mods, custom maps, or software patches. Analysis of the File