Open CTG File

Information, tips and instructions

Open CTG File

Files with CTG extension refer to catalogs used by Canon digital cameras. These CTG files are usually stored in the CANONMSC folder of your Canon digital camera, so when you connect it to your computer through a USB connection, you can access them.

The CTG file extension works as a bookmark for your computer, giving you information about the images contained in folders on the Canon camera's memory card. This information allows the memory card to index the photographs you have taken.

In other words, the CTG files organize the photographs based on the date they were taken. These files are what allows you to navigate through the images you have previously taken when looking at them on your camera. Typical CTG files are not online.

Important considerations

CTG files should not be deleted, nor should you try to open a CTG file. That is, CTG files are not designed to be opened or operated outside the context of the camera, therefore there is no suitable application to work directly with them.

These files are necessary for the memory card in your camera to function properly. When you delete the photos from your memory card, the CTG file will also be deleted automatically.

Open CTG File on Windows OS

  • Try double clicking on a CTG file in Windows File Explorer.
  • If the CTG file opener and viewer software is associated correctly then the file will open
  • If your CTG file does not open and it is a Canon Catalog File you need to look for JPG files which this CTG file accompanies. CTG file on itself does not contain any image information and is auxilary.
  • If your CTG file is not Canon Catalog File you can use one of the hex editors like HxD, WinHex, UltraEdit to open it and view what is inside.
  • Based on the contents of the CTG file you can try to figure the right program to open it.

Get more information about how to open CTG file.

Also check how to:

If you are not able to open file with certain file extension make sure to check if extension for the file is correct. It is possible that information in the file doesn't match file extension.

File Extension Info

CTG Quick Info
  Canon Photos Catalogue File
Opens with
  Canon Cameras