| yxwv | Alteryx Designer App Values Data |
| yxzp | Alteryx Designer Packaged Workflow Data |
| yyc | Wave Sapphire Distribution Data |
| z1 | Z-machine Z-code File |
| z2 | Z-machine Z-code File |
| z2s | SATURN Suite Zones to Sectors Data |
| z3 | Z-machine Z-code File |
| z32 | ZAR32 Saved Progress Data |
| z3l | ZW3D Part Library |
| z4 | Z-machine Z-code File |
| z5 | Z-machine Z-code File |
| z6 | Z-machine Z-code File |
| z64 | N64 ROM Image Mr. Backup Z64 |
| z7 | Z-machine Z-code File |
| z8 | Z-machine Z-code File |
| z80 | ZX Spectrum Emulator Snapshot Z80 |
| zak | Carlson Survey Coordinate Data |
| zal | SVAL Backup Data |
| zaloha | Miranda IM Data Backup |
| zam | ZTreeWin ZTreeWin Application Menu Data |
| zapc | ArcSoft Print Creations |
| zar | Zemax Archive |
| zargo | ArgoUML Model Data |
| zav | MT-Card Saved Game Data |
| zb | ZipBackup Backup Job |
| zbb | Zemax Black Box Data |
| zbd | Canon ZoomBrowser EX Database |
| zbf | Radiance Z-buffer File |
| zbf | Zemax Beam File |
| zbfx | eM Client Backup Data |
