| File Extension: | WCI |
| File Type Description: | Microsoft Indexing Service Catalog File |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Windows XP |
| Primary Software Developer: | Microsoft Corporation |
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Microsoft Corporation developed the Microsoft Indexing Service Catalog File file type when the Windows XP was initially released. Internal website statistics show that WCI files are most popular with users in United States and those running the Windows 10 operating system. Most of these users are running the Google Chrome web browser.
 | Windows XP by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .M4U | Open Source | Video Files | MPEG-4 Playlist |
| .LANG | Mojang | Game Files | Minecraft Language File |
| .HT | Hilgraeve Inc | Settings Files | HyperTerminal Session File |
| .GFS | Glarysoft Ltd. | Data Files | Glarysoft Split File |
| .HXF | Microsoft Corporation | Data Files | Microsoft Help 2 Project Include File |
| .PER | Microsoft Corporation | Game Files | Age Of Empires Personality File |
| .RH | Microsoft Corporation | Developer Files | C++ Resource Header Data |
| .WQL | Microsoft Corporation | Data Files | Microsoft Office Data |
| .ALD | Microsoft Corporation | Data Files | Dynamics AX Application Label Data File |
| .SYLK | Microsoft Corporation | Data Files | Microsoft Symbolic Link File |
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