| File Extension: | FOS |
| File Type Description: | Fallout 3 Saved Game |
| File Type Developer: | Bethesda Softworks |
| Primary Associated Software: | Fallout 3 |
| Primary Software Developer: | Bethesda Softworks |
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Bethesda Softworks developed the Fallout 3 Saved Game file type when the Fallout 3 was initially released. Data from our web servers (annonymous users) show that FOS files are most popular in China and are often used by Windows 10. Most of these users are running the Google Chrome web browser.
 | Fallout 3 by Bethesda Softworks |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Playstation 3 System Software |
 | Xbox 360 |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .ESS | Bethesda Softworks | Game Files | The Elder Scrolls Saved Game |
| .FUZ | Bethesda Softworks | Audio Files | Bethesda Softworks Voice File |
| .PSC | Bethesda Softworks | Developer Files | Papyrus Script |
| .ESP | Bethesda Softworks | Game Files | Elder Scrolls Plugin File |
| .BIO | IBM | System Files | BIOS File |
| .SDP | Oracle Corporation | Data Files | StarOffice Presentation File |
| .GCD | General CADD Products | CAD Files | Generic CADD Drawing File |
| .CKM | Bethesda Softworks | Developer Files | Creation Kit Macro |
| .HKX | Bethesda Softworks | Game Files | The Elder Scrolls V: Skyrim Animation |
| .ACM | BioWare | Audio Files | Interplay Audio File |
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