This conversion seems to be used for a transfer of disk image saved as .000 files to a .img files used by CloneCD. You can do that with tools like IsoBuster, regardless if the .000 disk images originate from it or not as it supports most of such files.
Convert IsoBuster recovered CD/DVD image to CloneCD image file.
We found 3 software records in the database related to .000 to .img file format conversion.
Microsoft Windows software - convert 000 to img on Windows
A highly specialized and easy to use CD, DVD and blu-ray data recovery tool
Convert from 000 file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 000 to img. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A powerful CD/DVD-image-file editor, CD burner, and CD/DVD-backup tool
One of the disk image handling utilities and the default program for ISZ images