| File Extension: | SU |
| File Type Description: | Country Code Top-level Domain |
| File Type Developer: | Unknown Developer |
| Primary Associated Software: | Unknown Software |
| Primary Software Developer: | Unknown Developer |
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Release of the Unknown Software software program prompted the development of the Country Code Top-level Domain file type by Unknown Developer. Our internal web tracking data indicates that Windows 10 operating system users, and those living in China, are the most likely to use Country Code Top-level Domain files. A vast majority of these users are opting to use Google Chrome as their preferred internet browser.
 | Unknown Software by Unknown Developer |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .JPK | JPK Instruments | Graphic Files | JPK Instruments File Format |
| .BYL | Unknown Developer | Uncommon Files | Uncommon File Extension |
| .FCX | Patton & Patton Software | 3D Image Files | Flow Charting Diagram File |
| .OLD | Unknown Developer | Backup Files | Backup Archive File |
| .CDIC | Unknown Developer | Data Files | ConlangDictionary File |
| .HPRT | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .UNM | Unknown Developer | Uncommon Files | Uncommon File Extension |
| .HWK | Unknown Developer | Uncommon Files | Uncommon File Extension |
| .SAF | DeLorme | GIS Files | Street Atlas USA Map File |
| .UTB | Unknown Developer | Backup Files | µTBackup Backup |
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*Files that are not supported can be opened in binary format.
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