Le estensioni dei file iniziano con il carattere '#'
| Tipo di file | Categoria | Formato del file | |
|---|---|---|---|
| .!bt | Partially Downloaded Files | BitTorrent incompleta Download File | |
| .!ut | Partially Downloaded Files | uTorrent incompleta Scarica | |
| .0 | Multiple Use Files | Hacha Split Archive File | |
| .000 | Multiple Use Files | Windows CE file dei dati di installazione | |
| .001 | Backup Files | Archive Split File | |
| .001 | Raster Graphics Files | File Fax | |
| .002 | Backup Files | Archive Split Parte 2 File | |
| .0xe | Program Execution Files | F-Secure Virus file rinominato | |
| .1 | Multiple Use Files | Sezione Unix 1 Man Pagina | |
| .123dx | CAD Files | 123D Design Model File | |
| .1pe | Data Files | TurboTax file di modulo | |
| .1ph | Data Files | File TurboTax | |
| .1st | Text Files | File Readme | |
| .264 | Digital Video Files | Ripped File Data Video | |
| .386 | Windows Device Driver Files | Di Windows Virtual Device Driver | |
| .3dm | 3D Files | Rhino Modello 3D | |
| .3dr | Data Files | 3DMark File Risultati | |
| .3ds | 3D Graphics Files | 3D Studio Scene | |
| .3dt | Data Files | File 3D Topicscape | |
| .3ga | Audio Files | 3GPP file audio | |
| .3gp | Digital Video Files | File 3GPP Multimedia | |
| .3me | Data Files | TurboTax file di modulo | |
| .3pe | Data Files | TurboTax 2008 file di modulo | |
| .411 | Raster Graphics Files | Mavica Mini immagine | |
| .4db | Development Files | 4th Dimension Struttura del database di file | |
| .4dd | Database Files | 4th Dimension file di database di dati | |
| .4dv | 4D File Format Files | 4D View Ultrasound File | |
| .4mp | Audio Files | File di database 4 MP3 | |
| .555 | Settings Files | Impostazioni Black & White meteo File | |
| .669 | Audio Files | UNIS Compositore 669 Modulo | |
| .6cm | Audio Files | Sei modulo canale | |
| .7z | Compressed Files | 7-Zip File compressi | |
| .8ba | Adobe Plug-in Files | Photoshop Plug-in | |
| .8bf | Adobe Plug-in Files | Filter Factory Image Filter | |
| .8bi | Adobe Plug-in Files | Photoshop Plug-in | |
| .8cm | Audio Files | Otto modulo canale | |
| .8xg | Data Files | TI-83/84 File Group Plus | |
| .8xk | Data Files | TI-83 Plus Application File di aggiornamento | |
| .8xs | Data Files | TI-83/84 file più String | |
| .8xv | Data Files | TI-83/84 Plus Testo variabile |