File Extension CTT

.CTT File

File extension: CTT
File type: Saved Contact List


Notes about the CTT file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The CTT file type is primarily associated with 'MSN Messenger' by MSN. This file can be opened in a text editor (e.g., Notepad). Older versions were text; newer versions are XML.

Detailed information for file extension CTT:


Primary association: MSN Messenger
Company: MSN
File classification: XML
Identifying characters Hex: 3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31 2E 30 22 3F 3E 0D 0A 3C 6D 65 73 73 65 6E 67 65 72 , ASCII: .?xml.version="1.0"?....messenger

Other applications associated with file type CTT:

File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension CTT click this link to expand/hide the additional area.

System Info for File Extension .CTT

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: MessengerContactList, FileType: Messenger Contact List

ProgramID: LabVIEWControlTemplate
EXEFile: C:\Robolab 2.5.4\Robolab254.exe %1

ProgramID: LabVIEWControlTemplate
EXEFile: %ProgramFiles%\National Instruments\LabVIEW 6 Eval\LabVIEW.exe %1

ProgramID: LabVIEWControlTemplate
EXEFile: %ProgramFiles%\National Instruments\LabVIEW 6.1\LabVIEW.exe

ProgramID: LabVIEWControlTemplate
EXEFile: %ProgramFiles%\Robolab\Engine\ROBOLAB252.exe


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