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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .3IN | Microsoft Corporation | Data Files | MSN Setup Information | MSN Explorer | Microsoft Corporation |
| .DOWNLOADHOST | Microsoft Corporation | Settings Files | MSN Explorer Download View | MSN Explorer | Microsoft Corporation |
| .MAILHOST | Microsoft Corporation | Settings Files | MSN Mailhost Settings File | MSN Explorer | Microsoft Corporation |
| .NAV | Valve | Game Files | Id Tech 3 Bot Navigation File | MSN Explorer | Microsoft Corporation |
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