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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .S1N | SealedMedia | Encrypted Files | Sealed PNG Graphic File | Unsealer | Oracle Corporation |
| .SAGE | Sage | Encrypted Files | Sage Ransomware Affected Data | Mozilla Thunderbird | Mozilla |
| .SBE | Safer Networking Ltd. | Encrypted Files | Spybot Exclude Data | Spybot - Search & Destroy | Safer Networking Ltd. |
| .SDA | Oracle Corporation | Encrypted Files | StarOffice Drawing | Apache OpenOffice | Apache Software Foundation |
| .SEF | Steganos | Encrypted Files | Password Manager Container File | Steganos Password Manager | Steganos |
| .SLG | Dionex Corporation | Encrypted Files | Chromeleon Audit Trail Data | Chromeleon | Dionex Corporation |
| .SME | Samsung Electronics | Encrypted Files | Samsung Mobile Backup File | Samsung Kies | Samsung Electronics |
| .SPN | Corel | Encrypted Files | Corel WordPerfect Distribution Definition | Corel WordPerfect | Corel |
| .STI | Oracle Corporation | Encrypted Files | StarOffice Presentation Template | Apache OpenOffice | Apache Software Foundation |
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