| 1 | ACSM | Adobe Systems | Adobe Content Server Message Format |
| 2 | ASEC | Google | Android Secure Application Format |
| 3 | BPK | Nero | Nero SecurDisc Public Key Format |
| 4 | BTOA | N/A | Binary-to-ASCII Encoded Format |
| 5 | CHML | Krasbit Technologies | Chameleon Encrypted Database Format |
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| 6 | CRL | N/A | Certificate Revocation List Format |
| 7 | CRYPT | WhatsApp Inc. | WhatsApp Messenger Encrypted Message Database Backup |
| 8 | CRYPT10 | WhatsApp | WhatsApp Encrypted Database File |
| 9 | CRYPT11 | N/A | WhatsApp Messenger encrypted message database backup |
| 10 | CRYPT12 | WhatsApp | WhatsApp Encrypted Database File |
| 11 | CRYPT5 | WhatsApp Inc. | WhatsApp Messenger Encrypted Message Database Backup |
| 12 | CRYPT6 | WhatsApp Inc. | WhatsApp Messenger Encrypted Message Database Backup |
| 13 | CRYPT7 | WhatsApp Inc. | WhatsApp Messenger Encrypted Message Database Backup |
| 14 | CRYPT8 | WhatsApp | WhatsApp Encrypted Database File |
| 15 | CRYPT9 | WhatsApp | WhatsApp Encrypted Database File |
| 16 | CSJ | BlackBerry (Research In Motion Limited) | RIM CSJ Registration |
| 17 | CXT | Adobe Systems | Director Protected Cast Format |
| 18 | CZIP | WinInizio Software | ZipGenius CryptoZip Format |
| 19 | DB.CRYPT5 | N/A | WhatsApp Messenger encrypted message database backup |
| 20 | DB.CRYPT7 | N/A | WhatsApp Messenger encrypted message database backup |
| 21 | DB.CRYPT8 | WhatsApp | WhatsApp Encrypted Database File |
| 22 | DCO | COSECT, Ltd. | DisCryptor Encrypted Archive |
| 23 | ESLOCK | ES APP Group | ES File Explorer File Manager Encrypted File |
| 24 | HDS | Microsoft | Microsoft PlayReady Data Format |
| 25 | HSH | Microsoft | Windows Catalog Search Index Format |
| 26 | IMG3 | Apple | IPhone IMG3 Format |
| 27 | IWA | Apple | iWork Archive File |
| 28 | JPGENX | Egis Technology Inc. | Egis Encrypted JPG |
| 29 | JSE | Microsoft | JScript Encoded Format |
| 30 | KDB | KeePass Password Safe | Keypass Database Format |
| 31 | KDBX | KeePass Password Safe | KeePass Password Database |
| 32 | KEY | N/A | Licence Or Encrypted Security Format |
| 33 | KEYCHAIN | Apple | Mac OS X Keychain Format |
| 34 | MIM | Internet Engineering Task Force | Multi-Purpose Internet Mail Message Format |
| 35 | MPQE | Blizzard Entertainment, Inc. | Blizzard Encrypted Game Data |
| 36 | NIP | Microsoft Corporation | Microsoft DRM (Digital Right Management) |
| 37 | OBB | Google | Android Opaque Binary Blob Format |
| 38 | P12 | RSA Laboratories | Personal Information Exchange Format |
| 39 | P7E | The Electric Quilt Company | SecureSoft Encrypted |
| 40 | P7M | RSA Data Security | Digitally Encrypted Message |
| 41 | P7S | N/A | Digitally Signed Email Message |
| 42 | P7Z | N/A | S/MIME Compressed Message |
| 43 | PEM | N/A | Privacy Enhanced Mail Certificate |
| 44 | PFX | N/A | PKCS #12 Certificate Format |
| 45 | PJPG | N/A | Progressive JPEG Image |
| 46 | PKPASS | Apple | Passbook Pass Format |
| 47 | POO | NCsoft Corporation | On-Line Game Protected |
| 48 | PTXT | Avid Technology | Pro Tools Session Template |
| 49 | RFP | Siber Systems | RoboForm Passcard Format |
| 50 | RSA | N/A | RSA Certificate Format |
| 51 | RSDF | RapidShare | RapidShare Download Format |
| 52 | SIGNED | Apple, Inc. | Apple Safari |
| 53 | STH | IBM | Lotus Domino Stash Format |
| 54 | TC | TrueCrypt | TrueCrypt Volume |
| 55 | TIFENX | N/A | egis encrypted TIFF image |
| 56 | UU | N/A | Uuencoded Format |
| 57 | UUE | N/A | Uuencoded Format |
| 58 | VDATA | Squid Tooth | Vaulty Vault Format |
| 59 | WBC | AG Interactive | Webshots Collection Format |
| 60 | XXE | N/A | XXEncoded Format |
| 61 | YENC | N/A | YEnc Format |
| 62 | YNC | N/A | YEnc Encoded Format |
