CTT File Extension

What is CTT file?

CTT filename suffix is mostly used for Messenger Contact List files. Microsoft defined the Messenger Contact List format standard. CTT files are supported by software applications available for devices running Mac OS, Windows. CTT file belongs to the Data Files category just like 1326 other filename extensions listed in our database. The most popular program for handling CTT files is MSN Messenger, but users can choose among 1 different programs that support this file format.

Programs which support CTT file extension

The following list contains programs grouped by 2 operating systems that support CTT files. Files with CTT extension, just like any other file formats, can be found on any operating system. The files in question may be transferred to other devices, be it mobile or stationary, yet not all systems may be capable of properly handling such files.

How to open file with CTT extension?

Being unable to open files with CTT extension can be have various origins. On the bright side, the most encountered issues pertaining to Messenger Contact List files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. We have prepared a listing of which will help you resolve your problems with CTT files.

Step 1. Get the MSN Messenger

Problems with opening and working with CTT files are most probably having to do with no proper software compatible with CTT files being present on your machine. The most obvious solution is to download and install MSN Messenger or one to the listed programs: Microsoft Messenger. Above you will find a complete listing of programs that support CTT files, classified according to system platforms for which they are available. The safest method of downloading MSN Messenger installed is by going to developer’s website () and downloading the software using provided links.

Step 2. Check the version of MSN Messenger and update if needed

If you already have MSN Messenger installed on your systems and CTT files are still not opened properly, check if you have the latest version of the software. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. If you have an older version of MSN Messenger installed, it may not support CTT format. The latest version of MSN Messenger should support all file formats that where compatible with older versions of the software.

Step 3. Associate Messenger Contact List files with MSN Messenger

If the issue has not been solved in the previous step, you should associate CTT files with latest version of MSN Messenger you have installed on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent

Selecting the first-choice application in Windows

• Choose the Open with entry from the file menu accessed by right-mouse clicking on the CTT file
• Next, select the Choose another app option and then using More apps open the list of available applications
• The last step is to select Look for another app on this PC option supply the directory path to the folder where MSN Messenger is installed. Now all that is left is to confirm your choice by selecting Always use this app to open CTT files and clicking OK.

Selecting the first-choice application in Mac OS

• From the drop-down menu, accessed by clicking the file with CTT extension, select Information
• Find the Open with option – click the title if its hidden
• From the list choose the appropriate program and confirm by clicking Change for all....
• If you followed the previous steps a message should appear: This change will be applied to all files with CTT extension. Next, click the Continue button to finalize the process.

Step 4. Check the CTT for errors

If you followed the instructions form the previous steps yet the issue is still not solved, you should verify the CTT file in question. It is probable that the file is corrupted and thus cannot be accessed.

1. Check the CTT file for viruses or malware

Should it happed that the CTT is infected with a virus, this may be that cause that prevents you from accessing it. Scan the CTT file as well as your computer for malware or viruses. CTT file is infected with malware? Follow the steps suggested by your antivirus software.

2. Check whether the file is corrupted or damaged

If you obtained the problematic CTT file from a third party, ask them to supply you with another copy. It is possible that the file has not been properly copied to a data storage and is incomplete and therefore cannot be opened. When downloading the file with CTT extension from the internet an error may occurred resulting in incomplete file. Try downloading the file again.

3. Verify whether your account has administrative rights

There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log in using an administrative account and see If this solves the problem.

4. Make sure that the system has sufficient resources to run MSN Messenger

The operating systems may note enough free resources to run the application that support CTT files. Close all running programs and try opening the CTT file.

5. Verify that your operating system and drivers are up to date

Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with Messenger Contact List files. It is possible that one of the available system or driver updates may solve the problems with CTT files affecting older versions of given software.

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