| .ASC | Symantec Corporation | Ficheiros Codificados | PGP (Pretty Good Privacy) ASCII Armored File | UltraEdit | IDM Computer Solutions |
| .ASCII | Sublime HQ Pty Ltd | Ficheiros de Texto | ASCII Text | UltraEdit | IDM Computer Solutions |
| .B | Rockstar Games | Ficheiros de Jogo | Grand Theft Auto 3 Saved Game File | UltraEdit | IDM Computer Solutions |
| .CF | Proofpoint, Inc. | Ficheiros de Configurações | Sendmail Configuration File | UltraEdit | IDM Computer Solutions |
| .CFG | Unknown Developer | Ficheiros de Desenvolvedor | Configuration File | UltraEdit | IDM Computer Solutions |
| .CONFIG | Unknown Developer | Ficheiros de Desenvolvedor | Configuration File | UltraEdit | IDM Computer Solutions |
| .DOK | Nenad Hrg | Ficheiros de Configurações | DesktopOK Icons Layout File | UltraEdit | IDM Computer Solutions |
| .DTD | Syncro Soft | Ficheiros de Desenvolvedor | Document Type Definition File | UltraEdit | IDM Computer Solutions |
| .EW | OpenEuphoria | Ficheiros de Desenvolvedor | Euphoria Source Code File | UltraEdit | IDM Computer Solutions |
| .EX | Symantec Corporation | Ficheiros de Configurações | Norton Ghost Template Data | UltraEdit | IDM Computer Solutions |
| .EXW | OpenEuphoria | Ficheiros de Desenvolvedor | Euphoria Source Code File | UltraEdit | IDM Computer Solutions |
| .FAQ | The Document Foundation | Ficheiros de Imagem 3D | Frequently Asked Questions Document | UltraEdit | IDM Computer Solutions |
| .GM | GameMonkey | Ficheiros de Desenvolvedor | GameMonkey Script | UltraEdit | IDM Computer Solutions |
| .HRL | Ericsson Computer Science Laboratory | Ficheiros de Desenvolvedor | Erlang Header File | UltraEdit | IDM Computer Solutions |
| .HVC | Sublime HQ Pty Ltd | Ficheiros de Texto | ASCII Text | UltraEdit | IDM Computer Solutions |
| .KBD | Autodesk, Inc. | Ficheiros de Configurações | 3ds Max Keyboard Shortcuts File | UltraEdit | IDM Computer Solutions |
| .KDS | Knyzhov Dmitry | Ficheiros de Configurações | KD Player Skin File | UltraEdit | IDM Computer Solutions |
| .LIS | SourceForge | Ficheiros de Texto | SQR (Structured Query Reporting) Output File | UltraEdit | IDM Computer Solutions |
| .MB1 | Apogee Software, Ltd. | Ficheiros de Jogo | Monster Bash Game Data File | UltraEdit | IDM Computer Solutions |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | UltraEdit | IDM Computer Solutions |
| .NLS | Uri Wilensky | Ficheiros de Desenvolvedor | NetLogo Source Code File | UltraEdit | IDM Computer Solutions |
| .NOW | The Document Foundation | Ficheiros de Texto | Readme Text Document File | UltraEdit | IDM Computer Solutions |
| .PB1 | Broderbund | Ficheiros de Dados | Broderbund 3D Home Architect Data | UltraEdit | IDM Computer Solutions |
| .PHL | Amazon | Ficheiros de eBook | Kindle Popular Highlights File | UltraEdit | IDM Computer Solutions |
| .RAC | Concept2 Inc. | Ficheiros de Dados | Venue Race Application File Format | UltraEdit | IDM Computer Solutions |
| .README | The Document Foundation | Ficheiros de Texto | Readme Text Document File | UltraEdit | IDM Computer Solutions |
| .SKI | Motorola | Ficheiros de Configurações | Motorola Phone Skin File | UltraEdit | IDM Computer Solutions |
| .SMS | Sega | Ficheiros de Jogo | Sega Master System ROM | UltraEdit | IDM Computer Solutions |
| .STC | Adobe Systems Incorporated | Ficheiros Web | Contribute Connection Key File | UltraEdit | IDM Computer Solutions |
| .STRING | IDM Computer Solutions | Ficheiros de Dados | UltraEdit Data | UltraEdit | IDM Computer Solutions |
| .SVH | IEEE Xplore | Ficheiros de Desenvolvedor | SystemVerilog Source Code Header File | UltraEdit | IDM Computer Solutions |
| .TLD | The Eclipse Foundation | Ficheiros de Desenvolvedor | Tag Library Descriptor File | UltraEdit | IDM Computer Solutions |
| .TOPC | 3d-scape Limited | Ficheiros de Dados | TopicCrunch Project File | UltraEdit | IDM Computer Solutions |
| .UENC | IDM Computer Solutions | Ficheiros Encriptados | UltraEdit Encrypted Text File | UltraEdit | IDM Computer Solutions |
| .UPD | Various Developers | Ficheiros de Texto | Program Update Information | UltraEdit | IDM Computer Solutions |
| .VNT | Sony | Ficheiros de Texto | Sony Ericsson Mobile Phone vNote File | UltraEdit | IDM Computer Solutions |
| .Y | Microsoft Corporation | Ficheiros de Imagem Raster | Subsampled Raw YUV Image | UltraEdit | IDM Computer Solutions |
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