| .ENG | Unknown Developer | Pelitiedostot | Chess Engine | Microsoft Train Simulator | Kuju Entertainment |
| .ENV | Adobe Systems Incorporated | Datatiedostot | Adobe Dictionary Data File | Microsoft Train Simulator | Kuju Entertainment |
| .MKR | Microsoft Corporation | Pelitiedostot | Train Simulator Marker File | Microsoft Train Simulator | Kuju Entertainment |
| .REF | Clark Labs | GIS-tiedostot | IDRISI Raster Image Reference File | Microsoft Train Simulator | Kuju Entertainment |
| .S | Unknown Developer | Sovelluskehittäjän tiedostot | Source Code File | Microsoft Train Simulator | Kuju Entertainment |
| .SMS | Sega | Pelitiedostot | Sega Master System ROM | Microsoft Train Simulator | Kuju Entertainment |
| .TIT | Microsoft Corporation | Pelitiedostot | Train Simulator Track Interactive Table File | Microsoft Train Simulator | Kuju Entertainment |
| .TRF | TorrentRover | Datatiedostot | TorrentRover File | Microsoft Train Simulator | Kuju Entertainment |
| .W | Progress Software Corporation | Sovelluskehittäjän tiedostot | OpenEdge Architect Source Code File | Microsoft Train Simulator | Kuju Entertainment |
| .WAG | Kuju Entertainment | Pelitiedostot | Train Simulator Wagon File | Microsoft Train Simulator | Kuju Entertainment |
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