| File Extension: | CTT |
| File Type Description: | Messenger Contact List |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft Notepad |
| Primary Software Developer: | Microsoft Corporation |
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Don Ho created the Messenger Contact List (CTT) file for the Notepad++ software series. Internal website statistics show that CTT files are most popular with users in United States and those running the Windows 10 operating system. Google Chrome is their primary internet browser for the bulk of these users.
 | Sublime Text by Sublime HQ Pty Ltd |
 | Microsoft Messenger by Microsoft Corporation |
 | Microsoft Notepad by Microsoft Corporation |
 | LabVIEW by National Instruments |
 | Notepad++ by Don Ho |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .ORP | PV & Associates | Data Files | WinSLAM File |
| .SP1 | Microsoft Corporation | Data Files | Microsoft Windows XP With Service Pack 1 Installation Data |
| .TRX | Microsoft Corporation | Developer Files | Visual Studio Test Results File |
| .PSW | Microsoft Corporation | Uncommon Files | Windows Password Reset Disk File |
| .SCM | Gimpel Software | Plugin Files | GIMP Script-Fu Script |
| .STP | Unknown Developer | 3D Image Files | STEP 3D CAD File |
| .VSIXLANGPACK | Microsoft Corporation | Settings Files | Microsoft Visual Studio Localised VSIX Package |
| .STT | Microsoft Corporation | GIS Files | Streets & Trips Map Template |
| .QPR | Microsoft Corporation | Developer Files | FoxPro Generated Query Program |
| .XGS | Microsoft Corporation | Settings Files | XACT Global Settings File |
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