| File Extension: | OPTNS |
| File Type Description: | Unknown Apple II File |
| File Type Developer: | found on Golden Orchard Apple II CD Rom |
| Primary Associated Software: | Unknown Apple II File |
| Primary Software Developer: | found on Golden Orchard Apple II CD Rom |
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 | Unknown Apple II File by found on Golden Orchard Apple II CD Rom |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .JDP | BlackBerry | Uncommon Files | BlackBerry JDE Data |
| .GOD | 4D, Inc | Game Files | Gore Game Data File |
| .JNJ | Unknown Developer | Uncommon Files | Unknown File Type |
| .MOJ | Unknown Developer | Uncommon Files | Unknown File Type |
| .PC9 | Unknown Developer | Uncommon Files | Uncommon File Extension |
| .PGP | Autodesk, Inc. | Settings Files | AutoCAD Program Parameters File |
| .LRC | Various Developers | Uncommon Files | Lyrics File |
| .PID | Open Source | Uncommon Files | Process ID File |
| .GSP | Ipswitch, Inc. | Web Files | IMail Error Message File |
| .CML | Unknown Developer | Data Files | Chemical Markup Language File |
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