CR File

What are CR files and how to open them

Are you having problems opening a CR 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 CR files.

What is a CR file?

A .CR file is an IFF Cruncher Compressed Data file.

IFF Cruncher Compressed Data is a lossless compression format designed to wrap arbitrary data in an IFF-style ("Interchange File Format") container and compress its contents so that they take up less storage space. This format is used when a program or system needs to store or transmit data more compactly, and then later decompress it for processing or use.

Files in this format are produced by data compression tools that support the IFF wrapper structure and embed compressed data inside it. After decompression, the original data is recovered without loss. Typical operations are compress-then-decompress; editing tools may decompress to work on the data and re-compress to store it again, preserving internal structure.

A key signature that identifies this format is the ASCII header "TTW!" appearing at the very start of the file (bytes 0x54 0x54 0x57 0x21) at offset zero.

How to open CR files

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

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

Last updated: September 18, 2026

Various apps that use files with this extension

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

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 CR file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.