| File Extension: | OC_ |
| File Type Description: | Compressed ActiveX Control File |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Windows |
| Primary Software Developer: | Microsoft Corporation |
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Compressed ActiveX Control File files were originally developed by Microsoft Corporation for the Microsoft Windows software application. Data from our web servers (annonymous users) show that OC_ files are most popular in United States and are often used by Windows 10. A vast majority of these users are opting to use Google Chrome as their preferred internet browser.
 | Microsoft Windows by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .MPT | Microsoft Corporation | Data Files | Microsoft Project Template |
| .HH | Microsoft Corporation | Developer Files | C++ Header File |
| .HXE | Microsoft Corporation | Data Files | Microsoft Windows Help Samples Definition File |
| .PGP | Autodesk, Inc. | Settings Files | AutoCAD Program Parameters File |
| .XRM-MS | Microsoft Corporation | System Files | Microsoft Security Certificate |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File |
| .H1Q | Microsoft Corporation | Uncommon Files | Microsoft Help Merged Query Index |
| .ACS | Microsoft Corporation | Uncommon Files | Agent Character File |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File |
| .NRW | Nikon | Camera Raw Files | Nikon Raw Image File |
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