Opening CTG files

Did your computer fail to open a CTG file? We explain what CTG files are and recommend software that we know can open or convert your CTG files.

What is a CTG file?

Files that contain the .ctg file extension are Catalog index files. These files are created by certain Canon digital cameras. When a Canon digital camera takes a photograph, it stores the photo in a folder on the camera's memory card.

The CTG file stores information about the number of pictures that are stored in each folder located on the camera's memory card. These files allow your computer to index the files and populate them to your computer. The CTG file does not contain any actual image data, rather it just contains an index of the data contained in the folder.

Try a universal file viewer

In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.

By Prof. Jones (The File Expert)

Chief Content Editor and File Expert

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