How can I obtain the file for an external MS-DOS command?
Because each version of MS-DOS and Windows is different, many of the external commands those programs are not going to be compatible. Therefore, if you want to use a specific external command, you'll need to find a third-party utility that provides the functionality for you.
Many individuals and companies have created MS-DOS commands capable of performing new functions. Additionally, there are some programs capable of accomplishing tasks that are not normally possible with any MS-DOS commands. Perform a search on any popular search engine for "command line," "download," or "windows" and a brief description of what you are looking to do. For example, searching "windows command line edit files download" would find Windows command line editors.
Some commands may work if copied directly from another computer running the version of Windows or MS-DOS that supports the command to your computer. However, this is not recommended because of incompatibility issues, as well as legal issues.