| .RDZ | Mandriva S.A. | Encoded Files | Mandrake Linux Install File | Mandriva Linux One | Mandriva S.A. |
| .RXF | Resort Software | Encoded Files | Recipe Exchange Format | Resort Recipe | Resort Software |
| .RZX | Red Zion | Encoded Files | File Crypt Encrypted File | Red Zion File Crypt | Red Zion |
| .S1A | Oracle Corporation | Encoded Files | Sealed Acrobat Document | Unsealer | Oracle Corporation |
| .S1E | SealedMedia | Encoded Files | Sealed Excel Worksheet File | Unsealer | Oracle Corporation |
| .SAFE | Interscape | Encoded Files | SIGLock Encrypted Extension File | Sigza SIGLock | Sigza Systems |
| .SCB | Scala | Encoded Files | Scala Published Script | Scala Designer | Scala |
| .SDO | Signere.no | Encoded Files | Signed Document | Signere.no Document Viewer | Signere.no |
| .SDOC | Samsung Electronics | Encoded Files | Samsung Memo File | Samsung Kies | Samsung Electronics |
| .SEB | Franklin Electronic Publishers, Inc. | Encoded Files | Franklin eBookMan E-book | Unknown Software | Unknown Developer |
| .SEF | Steganos | Encoded Files | Password Manager Container File | Steganos Password Manager | Steganos |
| .SFI | SafeSuite | Encoded Files | SafeFolder Encrypted File | SafeFolder | SafeSuite |
| .SHY | Dr. Bootz | Encoded Files | ShyFile Encrypted File | Dr. Bootz ShyFile | Dr. Bootz |
| .SIGN | Free Software Foundation | Encoded Files | GNU Privacy Guard Data | GNU Privacy Guard | GNU Project |
| .SJP | Oracle Corporation | Encoded Files | Sealed JPG File | Oracle IRM Desktop | Oracle Corporation |
| .SJPG | Oracle Corporation | Encoded Files | Sealed JPG File | Oracle IRM Desktop | Oracle Corporation |
| .SLM | Morrison Software | Encoded Files | Gallery Lock Hidden Media | Gallery Lock Pro | Morrison Software |
| .SNK | Microsoft Corporation | Encoded Files | Strong Name Key File | Microsoft Visual Studio | Microsoft Corporation |
| .SPD | AutoDesSys, Inc. | Encoded Files | Form-Z Suspended Render Data | AutoDesSys formZ | AutoDesSys, Inc. |
| .SPDF | Oracle Corporation | Encoded Files | Sealed PDF File | Oracle IRM Desktop | Oracle Corporation |
| .SUF | SourceForge | Encoded Files | Ccrypt Encrypted File | ccrypt | SourceForge |
| .SWITCH | Egress Software Technologies | Encoded Files | Switch Package | Egress Switch | Egress Software Technologies |
| .SXL | SealedMedia | Encoded Files | Sealed Excel Worksheet File | Unsealer | Oracle Corporation |
| .SXML | Oracle Corporation | Encoded Files | Sealed XML File | Oracle IRM Desktop | Oracle Corporation |
| .TMW | Simple DirectMedia Layer (SDL) | Encoded Files | Translation Memory Data File | SDL Trados | SDL Trados |
| .UEA | UPEK | Encoded Files | Protector Suite QL File | Protector Suite QL | UPEK |
| .UU | Open Source | Encoded Files | Uuencoded File | Apple Archive Utility | Apple |
| .UUD | Open Source | Encoded Files | UUDecoded File | UUDeview | Open Source |
| .UUE | Open Source | Encoded Files | Uuencoded File | Apple Archive Utility | Apple |
| .V2C | WellSight Systems | Encoded Files | WellSight Systems HASP SRM License Information Data | WellSight StripLog | WellSight Systems |
| .VBOX | Oracle Corporation | Encoded Files | Oracle VM VirtualBox Settings File | Oracle VM VirtualBox | Oracle Corporation |
| .VLT | zilliondigits | Encoded Files | WinVault File Archive | WinVault | zilliondigits |
| .VP | Accellera Systems Initiative | Encoded Files | Verilog Encrypted Source Code File | Xilinx ISE WebPACK | Xilinx, Inc. |
| .WCRY | Microsoft Corporation | Encoded Files | WannaCry Virus Encrypted File | System Restore | Microsoft Corporation |
| .WIX | Magix Software GmbH | Encoded Files | Xara Internal Graphics Data File | Xara Designer Pro X | Magix Software GmbH |
| .WLS | Renault | Encoded Files | R-Link Update File | R-Link Toolbox | Renault |
| .WMG | WinMagic | Encoded Files | SecureDoc Encrypted Hard Drive Control File | SecureDoc Disk Encryption | WinMagic |
| .WRYPT | Entropic | Encoded Files | Panwrypter Depleted Storage Volume File | PanWrypter | Entropic |
| .XIA | The German Federal Office for Information Security | Encoded Files | Chiasmus Encrypted File | Chiasmus | The German Federal Office for Information Security |
| .YENC | Open Source | Encoded Files | yEnc File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .YNC | Open Source | Encoded Files | yEnc Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ZEPTO | Microsoft Corporation | Encoded Files | Zepto Virus File | System Restore | Microsoft Corporation |
| .ZIPENX | Egis Technology Inc | Encoded Files | Egis Encrypted ZIP File | Egis | Egis Technology Inc |
| ._CRYPT | WhatsApp Inc | Encoded Files | Virus.Win32.Gpcode.ak | Unknown Software | Unknown Developer |
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