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