| File Extension: | HO |
| File Type Description: | Knowledge Explorer Knowledge Representation Hierarchy Outline |
| File Type Developer: | Open Source |
| Primary Associated Software: | my Knowledge Explorer |
| Primary Software Developer: | Open Source |
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Knowledge Explorer Knowledge Representation Hierarchy Outline files are the most popular type of files to carry the HO file extension, originally developed by Open Source for my Knowledge Explorer. Annoymous user data statistics infer that HO files are most popular in United States and with those using Windows 10 devices. Google Chrome is their primary internet browser for the bulk of these users.
 | my Knowledge Explorer by Open Source |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .PKB | Oracle Corporation | Developer Files | Oracle Package Body File |
| .NDB | Naviter | Data Files | SeeYou Waypoint File |
| .SVT | Runic Games | Game Files | Torchlight Saved Game File |
| .CYS | Hot Neuron | Database Files | Clustify Summary Statistics File |
| .EFG | Open Source | Developer Files | Gambit Extensive Game Format |
| .SG1 | Open Source | 3D Image Files | Standford Graphics File |
| .TTS | SumTotal Systems | Data Files | ToolBook Translation System File |
| .P10 | Open Source | Uncommon Files | Certificate Request File |
| .CA | AT&T Labs | Uncommon Files | Initial Telnet Cache |
| .NNA | NeuralWare | Developer Files | NeuralWare Data |
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