CBR files are actually Comic Book Archive Files. Generally, CBR files contains a number of compressed image files that are archived together using The RAR algorithm. Now, since CBR files are basically RAR files, you can extract its contents using software such as WinRar or 7zip. There are two ways to do this,
1. Rename the file’s extension to .rar and then extract it just like any other rar file.
2. Right click on the CBR file, click on Open,
Then choose either 7zip or WinRar from the programs list, and extract its contents.
Do let me know, using the comments form below, if you can’t open any CBR file using the above method.