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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .OCD | Ocad Inc. | GIS Files | OCAD Map File | OCAD | Ocad Inc. |
| .OCP | Zylox Software, Inc. | GIS Files | Offline Commander Project File | Offline Commander | Zylox Software, Inc. |
| .OKM | Gian Paolo Saliola | GIS Files | OkMap Map Defining File | OkMap | Gian Paolo Saliola |
| .OMD | Pitney Bowes | GIS Files | MapInfo Routing J Server Data | MapInfo Professional | Pitney Bowes |
| .OSB | Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others | GIS Files | OpenStreetMap Binary Map File | Merkaartor | Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others |
| .OSC | OpenStreetMap | GIS Files | OpenStreetMap Change File | Merkaartor | Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others |
| .OSL | Ockam Instruments | GIS Files | OckamSoft Log File | OckamSoft | Ockam Instruments |
| .OSM | OpenStreetMap | GIS Files | OpenStreetMap Map File | Merkaartor | Bart Vanhauwaert, Chris Browet, Ladislav Láska, and others |
| .OV2 | TomTom International BV | GIS Files | TomTom POI (Points Of Interest) Database | TomTom HOME | TomTom NV |
| .OZF2 | D & L Software Pty Ltd | GIS Files | OziExplorer Map File | OziExplorer | D & L Software Pty Ltd |
| .OZFX3 | D & L Software Pty Ltd | GIS Files | OziExplorer Image | OziExplorer | D & L Software Pty Ltd |
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