SUB .CCD .IMG files are not so unfamiliar compression models at present. To extract .Sub .CCD .IMG you can use any of the free softwares such as IsoBuster. Check out the guide on how to uncompress files from .ccd and all above mentioned formats.
Download & Install IsoBuster Open IsoBuster and Select File -> Open Image File
Point to the .img file that you want to extract.
Now that after selecting the file, Isobuster provides you with two options, you can either burn the files directly to a CD/DVD or you can extract them to the disk.
To extract the files, Click right on the image and select Extract.
Select the location to Extract and click Ok
This will extract all the files to the specified location.
