| File Extension: | WEF |
| File Type Description: | Microsoft Exchange File System Format |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Exchange Server |
| Primary Software Developer: | Microsoft Corporation |
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Microsoft Corporation developed the WEF file extension, also know as a Microsoft Exchange File System Format file, for the Microsoft Exchange Server software package. Our internal web tracking data indicates that Windows 10 operating system users, and those living in United States, are the most likely to use Microsoft Exchange File System Format files. A vast majority of these users are opting to use Google Chrome as their preferred internet browser.
 | Microsoft Exchange Server by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .MIDI | Synthesia LLC | Audio Files | MIDI File |
| .BAK | Various Developers | Backup Files | General Backup File |
| .RCJ | Microsoft Corporation | Text Files | Robocopy Job File |
| .IMD | Various Developers | GIS Files | GIS Image Metadata File |
| .H264 | Ulead Systems | Video Files | H.264 Encoded Video File |
| .XUI | Microsoft Corporation | Settings Files | Xbox 360 User Interface File |
| .GNX | Microsoft Corporation | Data Files | Microsoft PowerPoint Data |
| .PARTIAL | Microsoft Corporation | Uncommon Files | Internet Explorer Partially Downloaded File |
| .DATA | Appricon | Data Files | Analysis Studio Offline Data |
| .LOCK | Mozilla | Uncommon Files | Lock File |
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