| .509 | Microsoft Corporation | Ficheiros Web | Internet Security Certificate | Internet Explorer | Microsoft Corporation |
| .ADP | Microsoft Corporation | Ficheiros de Base de Dados | Access Project Extension | Internet Explorer | Microsoft Corporation |
| .AHTM | Unknown Developer | Ficheiros Web | HTML File | Internet Explorer | Microsoft Corporation |
| .ALX | BlackBerry | Ficheiros de Configurações | BlackBerry Application Loader XML File | Internet Explorer | Microsoft Corporation |
| .ASHX | Microsoft Corporation | Ficheiros Web | ASP.NET Web Handler File | Internet Explorer | Microsoft Corporation |
| .ASPX | Microsoft Corporation | Ficheiros Web | Active Server Page Extended ASP.NET Script | Internet Explorer | Microsoft Corporation |
| .AXD | Microsoft Corporation | Ficheiros Web | ASP.NET Web Handler File | Internet Explorer | Microsoft Corporation |
| .BOK | Pearson | Ficheiros de Dados | TestGen Testbank File | Internet Explorer | Microsoft Corporation |
| .BQY | Oracle Corporation | Uncommon Files | Brio Query File | Internet Explorer | Microsoft Corporation |
| .CDF | Wolfram Research | Ficheiros de Layout de Página | Computable Document Format File | Internet Explorer | Microsoft Corporation |
| .CER | Microsoft Corporation | Ficheiros Web | Internet Security Certificate | Internet Explorer | Microsoft Corporation |
| .CHK | Sophos | Ficheiros de Dados | InterCheck Checksum Database | Internet Explorer | Microsoft Corporation |
| .CHL | Leadtek Research | Ficheiros de Configurações | WinFast PVR2 Channel List | Internet Explorer | Microsoft Corporation |
| .CMP | Microsoft Corporation | Ficheiros de Configurações | Windows Connection Manager Profile | Internet Explorer | Microsoft Corporation |
| .CMS | Opera Software | Ficheiros Web | Content Management System Web Page File | Internet Explorer | Microsoft Corporation |
| .CPC | Cartesian Products, Inc. | Ficheiros de Imagem Raster | CPC Compressed Image File | Internet Explorer | Microsoft Corporation |
| .CRT | Mozilla | Ficheiros Web | Security Certificate | Internet Explorer | Microsoft Corporation |
| .DAT | Unknown Developer | Ficheiros de Jogo | Game Data | Internet Explorer | Microsoft Corporation |
| .DBM | Adobe Systems Incorporated | Ficheiros Web | ColdFusion Server File | Internet Explorer | Microsoft Corporation |
| .DER | Mozilla | Ficheiros Web | DER Certificate File | Internet Explorer | Microsoft Corporation |
| .DIAGSESSION | Microsoft Corporation | Ficheiros de Desenvolvedor | Diagnostics Session File | Internet Explorer | Microsoft Corporation |
| .DLL | Microsoft Corporation | Ficheiros de Sistema | Dynamic Link Library | Internet Explorer | Microsoft Corporation |
| .DML | Sybase, Inc | Ficheiros Web | DynaScript File | Internet Explorer | Microsoft Corporation |
| .DO | Unknown Developer | Ficheiros Web | Java Servlet | Internet Explorer | Microsoft Corporation |
| .ECE | Escenic | Ficheiros Web | Escenic Dynamic Web Page | Internet Explorer | Microsoft Corporation |
| .HQZ | Microsoft Corporation | Ficheiros de Dados | Internet Explorer For Mac File | Internet Explorer | Microsoft Corporation |
| .HT | Hilgraeve Inc | Ficheiros de Configurações | HyperTerminal Session File | Internet Explorer | Microsoft Corporation |
| .HT3 | Unknown Developer | Ficheiros Web | HTML File | Internet Explorer | Microsoft Corporation |
| .HTA | Microsoft Corporation | Ficheiros Executáveis | HTML Application | Internet Explorer | Microsoft Corporation |
| .HTC | Microsoft Corporation | Ficheiros Web | HTML Component File | Internet Explorer | Microsoft Corporation |
| .HTM | Various Developers | Ficheiros Web | Hypertext Markup Language File | Internet Explorer | Microsoft Corporation |
| .HTML | Various Developers | Ficheiros Web | Hypertext Markup Language File | Internet Explorer | Microsoft Corporation |
| .HTMLS | Open Source | Ficheiros Web | HTML With Server-Side Include | Internet Explorer | Microsoft Corporation |
| .ICW | Microsoft Corporation | Ficheiros de Configurações | Microsoft Internet Explorer Internet Connection Wizard Data | Internet Explorer | Microsoft Corporation |
| .IDQ | Microsoft Corporation | Ficheiros de Dados | Microsoft Internet Explorer Data Query File | Internet Explorer | Microsoft Corporation |
| .IHTML | Mozilla | Ficheiros Web | Inline HyperText Markup Language File | Internet Explorer | Microsoft Corporation |
| .INS | Open Source | Ficheiros de Dados | LaTeX Installer Script | Internet Explorer | Microsoft Corporation |
| .IWS | JetBrains | Ficheiros de Desenvolvedor | IntelliJ IDEA Web Page | Internet Explorer | Microsoft Corporation |
| .J | Oracle Corporation | Ficheiros de Desenvolvedor | Java Source File | Internet Explorer | Microsoft Corporation |
| .JFIF | Unknown Developer | Ficheiros de Imagem Raster | JPEG File Interchange Format | Internet Explorer | Microsoft Corporation |
| .JHTML | Oracle Corporation | Ficheiros Web | Java HTML Web Page | Internet Explorer | Microsoft Corporation |
| .JMH | Unknown Developer | Ficheiros de Imagem Raster | JPEG File Interchange Format | Internet Explorer | Microsoft Corporation |
| .JPG-LARGE | Zoner Software | Ficheiros de Imagem Raster | Large JPEG Image | Internet Explorer | Microsoft Corporation |
| .JSPA | Xinox Software | Ficheiros Web | Java Servlet Alias | Internet Explorer | Microsoft Corporation |
| .JVS | Opera Software | Ficheiros Web | JavaScript Proxy Autoconfig File | Internet Explorer | Microsoft Corporation |
| .LASSO | LassoSoft | Ficheiros Web | Lasso Database-Driven Web Page | Internet Explorer | Microsoft Corporation |
| .MAP | id Software | Ficheiros de Jogo | Quake Engine Map File | Internet Explorer | Microsoft Corporation |
| .MHT | Various Developers | Ficheiros Web | MHTML Web Archive | Internet Explorer | Microsoft Corporation |
| .MHTM | Microsoft Corporation | Ficheiros Web | Mime HTML (MHTML) File | Internet Explorer | Microsoft Corporation |
| .MHTML | Microsoft Corporation | Ficheiros Web | Mime HTML (MHTML) File | Internet Explorer | Microsoft Corporation |
| .MSPX | Microsoft Corporation | Ficheiros Web | Microsoft ASP.NET Web Page | Internet Explorer | Microsoft Corporation |
| .NMF | ESRI | Ficheiros GIS | ArcGIS Explorer Map File | Internet Explorer | Microsoft Corporation |
| .ODC | Microsoft Corporation | Ficheiros de Configurações | Office Data Connection File | Internet Explorer | Microsoft Corporation |
| .PAC | NetScape | Ficheiros Web | Proxy Auto-Config File | Internet Explorer | Microsoft Corporation |
| .PARTIAL | Microsoft Corporation | Uncommon Files | Internet Explorer Partially Downloaded File | Internet Explorer | Microsoft Corporation |
| .PHP4 | Open Source | Ficheiros Web | PHP 4 Web Page | Internet Explorer | Microsoft Corporation |
| .PHT | Microsoft Corporation | Ficheiros Web | Partial Hypertext | Internet Explorer | Microsoft Corporation |
| .PHTML | Opera Software | Ficheiros Web | PHP Web Page | Internet Explorer | Microsoft Corporation |
| .PJPEG | Microsoft Corporation | Ficheiros de Imagem Raster | Progressive JPEG Image | Internet Explorer | Microsoft Corporation |
| .PRF | Microsoft Corporation | Ficheiros de Configurações | Outlook Profile File | Internet Explorer | Microsoft Corporation |
| .QRM | Armangil Software | Ficheiros Web | Qworum Message File | Internet Explorer | Microsoft Corporation |
| .RHTML | Yukihiro “Matz” Matsumoto | Ficheiros Web | Ruby HTML Web Page | Internet Explorer | Microsoft Corporation |
| .RMH | Microsoft Corporation | Ficheiros de Dados | Rights-Managed HTML Document File | Internet Explorer | Microsoft Corporation |
| .RMT | The Catalina Group | Ficheiros de Sistema | Router Firmware File | Internet Explorer | Microsoft Corporation |
| .RTC | Brain Innovation | Ficheiros de Dados | BrainVoyager QX Design Matrix File | Internet Explorer | Microsoft Corporation |
| .SDL | Microsoft Corporation | Ficheiros de Desenvolvedor | Service Description Language File | Internet Explorer | Microsoft Corporation |
| .SHTM | Opera Software | Ficheiros de Vídeo | HTML Server Side Include File | Internet Explorer | Microsoft Corporation |
| .SMIL | "Synchronized Multimedia" Working Group (SYMM WG) | Ficheiros de Vídeo | SMIL(Synchronized Multimedia Integration Language) Presentation File | Internet Explorer | Microsoft Corporation |
| .SML | ESRI | Ficheiros de Desenvolvedor | ARC/INFO Simple Macro Language File | Internet Explorer | Microsoft Corporation |
| .SPOP | Opera Software | Ficheiros de Dados | InterTrust SPOP File | Internet Explorer | Microsoft Corporation |
| .SSH | Microsoft Corporation | Ficheiros Web | Microsoft Internet Explorer Style Sheet | Internet Explorer | Microsoft Corporation |
| .STM | Microsoft Corporation | Ficheiros de Dados | Exchange Streaming Media File | Internet Explorer | Microsoft Corporation |
| .TMP | Mozilla | Ficheiros de Cópia de Segurança | General Temporary File | Internet Explorer | Microsoft Corporation |
| .URL | Microsoft Corporation | Ficheiros Web | Internet Shortcut | Internet Explorer | Microsoft Corporation |
| .VBD | Microsoft Corporation | Ficheiros Web | Visual Basic ActiveX Document | Internet Explorer | Microsoft Corporation |
| .VRT | Superscape | Ficheiros Web | Virtual World | Internet Explorer | Microsoft Corporation |
| .W | Progress Software Corporation | Ficheiros de Desenvolvedor | OpenEdge Architect Source Code File | Internet Explorer | Microsoft Corporation |
| .WAF | Microsoft Corporation | Ficheiros Temporários | Internet Explorer For Mac Cache | Internet Explorer | Microsoft Corporation |
| .WEBM | Google | Ficheiros de Vídeo | WebM Video File | Internet Explorer | Microsoft Corporation |
| .WEBSITE | Microsoft Corporation | Ficheiros Web | Internet Explorer Pinned Site Shortcut | Internet Explorer | Microsoft Corporation |
| .WML | Syncro Soft | Ficheiros Web | Wireless Markup Language File | Internet Explorer | Microsoft Corporation |
| .WMV | Microsoft Corporation | Ficheiros de Vídeo | Windows Media Video File | Internet Explorer | Microsoft Corporation |
| .WOA | Apple | Ficheiros Web | WebObjects Application | Internet Explorer | Microsoft Corporation |
| .WOFF | Open Source | Ficheiros de Fonte | Web Open Font Format File | Internet Explorer | Microsoft Corporation |
| .XBAP | Microsoft Corporation | Ficheiros Executáveis | XAML Browser Application File | Internet Explorer | Microsoft Corporation |
| .XHTM | Opera Software | Ficheiros Web | Extensible Hypertext Markup Language Document | Internet Explorer | Microsoft Corporation |
| .XHTML | Opera Software | Ficheiros Web | Extensible Hypertext Markup Language Document | Internet Explorer | Microsoft Corporation |
de 1 
