Opening CTT Files

The CTT file type is primarily associated with Windows Live Messenger.

CTT	File extension: CTT
	File type:	XML file

What is a CTT file?

CTT files mostly belong to Windows Live Messenger. Purpose and Functionality:
This CTT file is an internal XML file used by Windows Live Messenger to store your contact list. The file holds useful details about each contact in a structured way. The XML format allows the contacts to be organized properly for fast access by the messenger.
How to Open and View:

Open the file with an XML editor to see the structured tags.

Use a basic text editor to view the XML code if needed.

Avoid making changes unless you are sure of the correct XML syntax.

FilExt.com tip: This file is not meant for regular manual editing. It is designed for the application to read and maintain your contact information.

How to open a CTT file

You need a suitable software like Windows Live Messenger to open a CTT file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CTT file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CTT file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CTT Text Viewer

Choose your .ctt file to view

or drag and drop it here

Online File Viewer

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How to extract texts from CTT files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

If you want to extract texts from CTT file or capture a screenshot, you can use our free Online CTT File Viewer:

Just click the "Choose your .ctt file to view" button on this page.
After your file is opened in browser,
click "Save as..." in the menu.
Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
Download the converted file.

Programs that open and convert CTT files:

Windows Live Messenger
See the previous paragraphs to learn more about the main application. CTT files are often referred to as Windows Live Messenger data files because this type of file is primarily created or used by this software.
CAIL Suite (Terminal Emulation Data) by CAIL Systems Inc.
CTT, in this case, stands for Cail - Total - Tandem because the product is made with Total Consulting Group and it connects to Tandem mainframe systems.
LabVIEW
Related links: Wikipedia LabVIEW Page
MSN Messenger (Saved Contact List) by MSN
This file can be opened in a text editor (e.g., Notepad). Older versions were text; newer versions are XML. The identifying characters used for this association are - 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. This file format is classified as XML.

CTT file format:

The file format determines how the data is stored in the file. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. When there is a problem with a file, the first step to solving it is to determine the file format. Our analysis of the CTT files produces the following result:

The CTT file extension is rarely used and mainly uses a special format. The two most common formats are as follows:

70% of all CTT files are MSN Messenger Saved Contact List files, which are using the popular XML file format. The Extensible Markup Language (XML) is a simple text-based format for representing structured information: documents, webpages, data, configuration, books, transactions, invoices, and much more. XML defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. These files are plain text, which means they can be viewed with any text editor such as Windows Editor, Nano for Linux, and TextEdit for macOS. CTT files are between 960 bytes and 20 KB in size. This is an old file type which is rarely used today. Certain words are almost always found in the files, such as <?xml version="1.0"?>, <contactlist>, <messenger>, hotmail, <service name=".NET Messenger Service"> and contact type. Such CTT files store data about hotmail, contacts, para, contactos, contatti, iler, live and contatos, and often consist of personal data.
8% of all CTT files start with the magic bytes CE BA 00 00, which are always the first bytes of this file format. The contents of these files cannot be read by a human; only a computer program can interpret the data. The average file size is 3 KB with most files being between 1 KB and 10 KB in size. The following keywords are characteristic: 5xhd.

The remaining 22% of all CTT files are different files with different signatures. Drag & drop your file here to see the file format and a preview of your CTT file!

Technical Data for CTT File Extension

File classification:

Data

Identifier:

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 (provided by TrID database)

Related files:

vcf, wab, cct, mco, mct, eit, xml, csv, txt

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

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

Show all 5 listings To Top

a ctt XML file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CTT files

Associate the CTT file extension with the correct application.
Update your software that should actually open xml files. Because only the current version supports the latest CTT file format. Search, therefore, e.g. on the manufacturer website after an available Windows Live Messenger update.
To make sure that your CTT file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CTT file online - secure, fast, and no downloads needed.