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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ADR | Opera Software | Web Files | Opera Bookmarks File | Opera | Opera Software |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Opera | Opera Software |
| .ASPX | Microsoft Corporation | Web Files | Active Server Page Extended ASP.NET Script | Opera | Opera Software |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | Opera | Opera Software |
| .BML | Various Developers | Web Files | Bean Markup Language File | Opera | Opera Software |
| .BOK | Pearson | Data Files | TestGen Testbank File | Opera | Opera Software |
| .CFM | Adobe Systems Incorporated | Web Files | ColdFusion Markup File | Opera Mini | Opera Software |
| .CMS | Opera Software | Web Files | Content Management System Web Page File | Opera | Opera Software |
| .DML | Sybase, Inc | Web Files | DynaScript File | Opera | Opera Software |
| .DO | Unknown Developer | Web Files | Java Servlet | Opera | Opera Software |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | Opera | Opera Software |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | Opera | Opera Software |
| .IWS | JetBrains | Developer Files | IntelliJ IDEA Web Page | Opera | Opera Software |
| .J | Oracle Corporation | Developer Files | Java Source File | Opera | Opera Software |
| .JFIF | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Opera | Opera Software |
| .JHTML | Oracle Corporation | Web Files | Java HTML Web Page | Opera | Opera Software |
| .JMH | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Opera | Opera Software |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Opera | Opera Software |
| .JVS | Opera Software | Web Files | JavaScript Proxy Autoconfig File | Opera | Opera Software |
| .LASSO | LassoSoft | Web Files | Lasso Database-Driven Web Page | Opera | Opera Software |
| .MAP | id Software | Game Files | Quake Engine Map File | Opera | Opera Software |
| .MBS | Opera Software | Uncommon Files | Opera Mailbox File | Opera | Opera Software |
| .MHT | Various Developers | Web Files | MHTML Web Archive | Opera | Opera Software |
| .MHTM | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Opera | Opera Software |
| .MHTML | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Opera | Opera Software |
| .MSPX | Microsoft Corporation | Web Files | Microsoft ASP.NET Web Page | Opera | Opera Software |
| .NEX | Opera Software | Compressed Files | Navigator Extension | Opera | Opera Software |
| .OBML | Opera Software | Web Files | Opera Mini Saved Web Page | Opera Mini | Opera Software |
| .OBML16 | Opera Software | Web Files | Opera Mini Saved Web Page | Opera Mini | Opera Software |
| .PHP2 | Open Source | Web Files | PHP 2 Web Page | Opera | Opera Software |
| .PHTM | The Catalina Group | Web Files | PHP-Based Web Page | Opera | Opera Software |
| .PHTML | Opera Software | Web Files | PHP Web Page | Opera | Opera Software |
| .POLICY | Oracle Corporation | Settings Files | Java Policy Implementation File | Opera | Opera Software |
| .PSP | Corel Corporation | Raster Image Files | PaintShop Pro Image | Opera | Opera Software |
| .QF | Nokia | Settings Files | Nokia (Ovi) Maps Version Data | Opera | Opera Software |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | Opera | Opera Software |
| .RMT | The Catalina Group | System Files | Router Firmware File | Opera | Opera Software |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | Opera | Opera Software |
| .SHTM | Opera Software | Video Files | HTML Server Side Include File | Opera | Opera Software |
| .SHTML | Sublime HQ Pty Ltd | Web Files | Server Side Include HTML File | Opera | Opera Software |
| .SPL | Microsoft Corporation | System Files | Windows Print Spool File | Opera | Opera Software |
| .SPOP | Opera Software | Data Files | InterTrust SPOP File | Opera | Opera Software |
| .SVR | Superscape | Web Files | Compressed Virtual World | Opera Mini | Opera Software |
| .TORRENT | BitTorrent | Uncommon Files | BitTorrent Information File | Opera | Opera Software |
| .VBD | Microsoft Corporation | Web Files | Visual Basic ActiveX Document | Opera | Opera Software |
| .VX | Opera Software | Web Files | Opera Browser Data | Opera | Opera Software |
| .WDGT | Opera Software | Web Files | Opera Widget File | Opera | Opera Software |
| .WEBLOC | Apple | Web Files | Mac OS X Website Location | Opera | Opera Software |
| .WEBM | Video Files | WebM Video File | Opera | Opera Software | |
| .WEBP | Raster Image Files | Google Image File Format | Opera | Opera Software | |
| .WGT | Interscape | Data Files | IMPS Data File | Opera | Opera Software |
| .WOA | Apple | Web Files | WebObjects Application | Opera | Opera Software |
| .WOFF | Open Source | Font Files | Web Open Font Format File | Opera | Opera Software |
| .XHTM | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Opera | Opera Software |
| .XHTML | Opera Software | Web Files | Extensible Hypertext Markup Language Document | Opera | Opera Software |
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