| File Extension: | EXT |
| File Type Description: | Norton Commander Extension |
| File Type Developer: | Symantec Corporation |
| Primary Associated Software: | Norton Commander |
| Primary Software Developer: | Symantec Corporation |
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Don Ho developed the EXT file extension, also know as a Norton Commander Extension file, for the Notepad++ software package. Annoymous user data statistics infer that EXT files are most popular in China and with those using Windows 10 devices. Google Chrome is their primary internet browser for the bulk of these users.
 | Gedit by GNOME |
 | Sublime Text by Sublime HQ Pty Ltd |
 | Apple TextEdit by Apple |
 | Norton Commander by Symantec Corporation |
 | Microsoft Notepad by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | DOS |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .BJG | Symantec Corporation | Data Files | DESQview File |
| .SV2I | Symantec Corporation | Backup Files | Symantec System Index File |
| .PFW | Symantec Corporation | Data Files | Symantec LiveAdvisor Data |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File |
| .HCT | Symantec Corporation | Data Files | Symantec LiveUpdate Data |
| .SDA | Oracle Corporation | Vector Image Files | StarOffice Drawing |
| .GHS | Symantec Corporation | Backup Files | Norton Ghost Image Segment Backup File |
| .GHO | Symantec Corporation | Backup Files | Norton Ghost Backup File |
| .SEC | Symantec Corporation | Uncommon Files | Pretty Good Privacy Secret Key Ring |
| .RRR | Symantec Corporation | Backup Files | Registry Mechanic Backup File |
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