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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ETF | NetScape | Text Files | Enriched Text Format E-mail Message | SmartMusic | MakeMusic, Inc. |
| .MUS | MakeMusic, Inc. | Audio Files | Finale Notation File | SmartMusic | MakeMusic, Inc. |
| .MUSX | MakeMusic, Inc. | Audio Files | Finale Notation File | SmartMusic | MakeMusic, Inc. |
| .SMA | Don Ho | Developer Files | C/C++ Source Code File | SmartMusic | MakeMusic, Inc. |
| .SMP | MakeMusic, Inc. | Audio Files | SmartMusic Performance File | SmartMusic | MakeMusic, Inc. |
| .SMX | MakeMusic, Inc. | Data Files | SmartMusic XML File | SmartMusic | MakeMusic, Inc. |
| .USR | FileMaker Inc. | Database Files | FileMaker Pro Database File | SmartMusic | MakeMusic, Inc. |
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