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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ASPX | Microsoft Corporation | Web Files | Active Server Page Extended ASP.NET Script | SeaMonkey | Mozilla |
| .CMS | Opera Software | Web Files | Content Management System Web Page File | SeaMonkey | Mozilla |
| .DML | Sybase, Inc | Web Files | DynaScript File | SeaMonkey | Mozilla |
| .DO | Unknown Developer | Web Files | Java Servlet | SeaMonkey | Mozilla |
| .JA | Trainz portal | Game Files | Jet Archive | SeaMonkey | Mozilla |
| .JHTML | Oracle Corporation | Web Files | Java HTML Web Page | SeaMonkey | Mozilla |
| .MSG | Microsoft Corporation | Text Files | Saved Email Message | SeaMonkey | Mozilla |
| .NA2 | Mozilla | Web Files | Netscape Address Book File | SeaMonkey | Mozilla |
| .PSP | Corel Corporation | Raster Image Files | PaintShop Pro Image | SeaMonkey | Mozilla |
| .SBD | Microsoft Corporation | Data Files | Office Accounting Company Data File | SeaMonkey | Mozilla |
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