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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .NDF | Microsoft Corporation | Database Files | SQL Server Secondary Database File | Microsoft SQL Server | Microsoft Corporation |
| .NE3 | OM2 Services LLC | Database Files | OM2 OMALI NENA Document | OM2 OMALI Professional | OM2 Services LLC |
| .NNT | Qualcomm | Database Files | Eudora Address Book File | QUALCOMM Eudora | Qualcomm |
| .NS3 | IBM | Database Files | Lotus Notes 3 Database | IBM Lotus Notes | IBM |
| .NS4 | IBM | Database Files | Lotus Notes 4 Database | IBM Lotus Notes | IBM |
| .NSF | Unknown Developer | Database Files | NES Sound Format File | DeliPlayer | Open Source |
| .NSG | IBM | Database Files | Lotus Notes Database | IBM Lotus Notes | IBM |
| .NV | Q.W.Page Associates Inc | Database Files | NewViews Database File | Q.W. Page NewViews 2 | Q.W.Page Associates Inc |
| .NV2 | Q.W.Page Associates Inc | Database Files | NewViews 2 Database File | Q.W. Page NewViews 2 | Q.W.Page Associates Inc |
| .NX1 | NexusDB Pty | Database Files | NexusDB File | NexusDB | NexusDB Pty |
| .NX2 | NexusDB Pty | Database Files | NexusDB Database File | NexusDB | NexusDB Pty |
| .NYF | Wjj Software | Database Files | MyBase Database File | Wjj Software myBase | Wjj Software |
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