| 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 |
|---|---|---|---|
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key |
| .XLD | Microsoft Corporation | Database Files | Excel Database File |
| .ACT | Bell Labs | Audio Files | ADPCM Compressed Audio File |
| .CPP | Open Source | Developer Files | C++ Source Code File |
| .JPG-LARGE | Zoner Software | Raster Image Files | Large JPEG Image |
| .CC | Don Ho | Developer Files | C/C++ Source Code File |
| .DCT | Microsoft Corporation | Data Files | Dictionary File |
| .F13 | Microsoft Corporation | Font Files | MS-DOS Screen Text 13 Pixels Height Font |
| .BGX | Bjarne Stroustrup | Graphic Files | BC45 |
| .CCH | Microsoft Corporation | Uncommon Files | .NET Security Resolution Cache File |
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