Programs enabling conversion of the file:
If your objective is to convert the file from 7Z to the file 001, you can use any of the applications listed. 7Z to 001 conversion process in every program intended for this purpose (so-called converters) is very intuitive and everyone is able to manage converting a file.
However, bear in mind that the list may also include programs to support and work with the indicated extensions 7Z and 001 - and not only converters. In such a case, you need to open the source file 7Z and from the options available in the program, choose ”Save as... 001" or "Export to 001".