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CTG File

What are CTG files and how to open them

Are you having problems opening a CTG file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CTG files.

What is a CTG file?

CTG files have multiple uses, and Canon Photo Catalog is one of them. Read more about the other uses further down the page.

Canon Photo Catalog

Files that contain the .ctg file extension are Catalog index files. Certain Canon digital cameras create these files. 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 folder's data.

How to open CTG files

Important: Different programs may use files with the CTG file extension for different purposes, so unless you are sure which format your CTG file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different CTG openers which you will find listed below.

Last updated: December 22, 2023

All known file formats using extension .CTG

While Canon Photo Catalog is a popular type of CTG-file, we know of 2 different uses of the .CTG file extension. Different software may use files with the same extension for different types of data.

ChessBase Opening Tree of Games

These CTG files contain chess opening books in a file format created by ChessBase. A chess opening refers to the initial moves of a chess game. This particular format stores information about white move positions, moves, annotations, engine recommendations, and statistics. Computer chess games use these files.

CTG opener for Windows

We have identified 3 CTG openers that are compatible with this specific type of CTG file.

ChessBase LightChessBase LightVerified
ChessBase ReaderChessBase ReaderVerified

Various apps that use files with this extension

These apps are known to open certain types of CTG files. Remember, different programs may use CTG files for different purposes, so you may need to try out a few of them to be able to open your specific file.

iTunesiTunesUser submitted
RealPlayerRealPlayerUser submitted
GOM PlayerGOM PlayerUser submitted
Corel PaintShop ProCorel PaintShop ProUser submitted
Windows Media PlayerWindows Media PlayerUser submitted
Adobe PhotoshopAdobe PhotoshopUser submitted
QuickTimeQuickTimeUser submitted
Adobe AcrobatAdobe AcrobatUser submitted
GWhereGWhereUser submitted
WhereIsItWhereIsItUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CTG file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.