Programs enabling conversion of the file:
If your objective is to convert the file from ICO to the file ICONTAINER, you can use any of the applications listed. ICO to ICONTAINER 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 ICO and ICONTAINER - and not only converters. In such a case, you need to open the source file ICO and from the options available in the program, choose ”Save as... ICONTAINER" or "Export to ICONTAINER".