| pjb | IBM InfoSphere Information Server Manager Data |
| pjd | Portfolio Exported Categories Data |
| pjf | iAddress Postal Job File |
| pjf | Photojunction File |
| pjl | HP Printer Job Language Data |
| pjn | Spectrum Projection Metadata |
| pjnz | Spectrum Projection Data |
| pjtf | Portable Job Ticket Format Data |
| pjv | Velocity User Selections Data |
| pjxl | HP PaintJet XL PCL Document |
| pk | Adobe Audition v3 Peak File |
| pk8 | PKCS8 Data |
| pka | Cisco Packet Tracer Activity File |
| pkb | Blackberry Password Keeper Encrypted Backup |
| pkb2 | Blackberry Password Keeper Encrypted Backup |
| pkc | Jython JAR Cache |
| pkcs12 | PKCS #12 Data File |
| pkcs7 | PKCS #7 Certificate Data |
| pkd | Eurotherm Encrypted Hydra History Data |
| pkf | Adobe Audition Peak File |
| pkg | DataFlex Compiled Package |
| pkgmeta | Bukkit Package Metadata |
| pkgx | Microsoft UE-V PKGX Data |
| pki | LibVirt PKI Data |
| pkj | PokerJuice Data |
| pkk | PuTTY Private Key |
| pkl | Migration Wizard Packing List File |
| pklg | Wireshark Packetlogger Data |
| pkn | Microsoft SMS Package Creation Notification |
| pkr | PGP Public Keyring File |