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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .XCS | DynaSend | Encrypted Files | BuzzLetter Encrypted Stationery Template | BuzzLetter | DynaSend |
| .XDC | Adobe Systems Incorporated | Encrypted Files | Adobe Acrobat Printer Description | Adobe Acrobat DC | Adobe Systems Incorporated |
| .XEA | Cryptomax | Encrypted Files | Encrypted Archive File | Cryptomax | Cryptomax |
| .XEF | X-Genics Limited | Encrypted Files | eManager Form Data | X-Genics eManager | X-Genics Limited |
| .XG | Mastermind Technology | Encrypted Files | XG Encryption Encrypted File | XG Encryption | Mastermind Technology |
| .XLSBENX | HITRUST Alliance | Encrypted Files | Encrypted XLSB (Excel 2007) File | Egis | Egis Technology Inc |
| .XTBL | Unknown Developer | Encrypted Files | XTBL Ransomware Encrypted File | AVG Antivirus | AVG Technologies |
| .XXX | BloodDolly | Encrypted Files | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .XYZ | SourceForge | Encrypted Files | Molecule Specification File | Avogadro | Open Source |
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