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