A .ctg file extension is a computer configuration file. You would need a special type of program or software to open or convert this type of file. To open a .cfg extension file, use a program called Free File Viewer.
The file extention is just .jpg The 128 x 96 is just a file size - it is NOT part of the extention.
Right click on the file then select open. In the new window select to choose a program from a list then choose notepad
A file with a .cfg extension is usually a configuration file. The file will be used by an application to load all the configuration settings. There is no standard format for a .cfg file and how it can be modified will differ from application to application.
A configuration file (.cfg) is normally a text file that can be opened in any text editor such as TextEdit. Some software will create a configuration file that will comprise non alphanumeric characters and so will appear to be random characters.
File Extention
You're computer is regonising a file as an "Unknown File" only because it has no understanding of that file extention. Right click the file and select "Properties", find the extention name (Eg, .exe) and search for software that will read that extention name. If you're having further problems consult someone on a Technical Help Forum.
It is the config/configuration file for the launcher.
To access the menu of the configuration (cfg) file in Counter-Strike 1.6, you need to locate the appropriate cfg file, typically named "config.cfg" or one you’ve created in the "cstrike" folder of your game directory. You can open this file using a text editor like Notepad. Once opened, you can modify various settings such as key binds, graphics options, and game preferences. After making changes, save the file and restart the game for the new settings to take effect.
A file tree is extention to a file that branches out
To edit an FSX (Flight Simulator X) cfg file using Notepad, first navigate to the FSX installation directory, typically found in "C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X" or a similar path. Locate the cfg file you want to edit, such as "fsx.cfg" for general settings or "Aircraft.cfg" for specific aircraft settings. Right-click on the file and select "Open with" > "Notepad." Make your desired changes, then save the file, ensuring you have backup copies in case you need to revert your changes.
You can use Notepad for that.
A file extention isn't needed but when your the file has a file extention the computer can easily find the appropiate program to run it. If a file doesnt have a file extension the computer will require you to find the appropiate program with means more work for you to do