China DOS Union

I couldn't find MS-DOS SHELL in System Enhancements. Where should this SHELL be placed? Can you tell me?

Because this SHELL is the most basic one, but I don't have it.

Because DOSSHELL comes with the DOS system itself, it wasn't put in “System Enhancements.” You can find it in “DOS Systems,” in things like “MS-DOS 7.10 full direct-run edition.”

Thanks for the DOSSHELL , but there's still one thing I don't understand, and that's the previous file (DOS 6.22 supplementary files).
I saw DOSSHELL mentioned in the notes too, but after downloading it, there was only one SUP622 file. What is that?
Can you explain?

SUP622 is a self-extracting file. After extracting it, DOSSHELL will be there.

I still want to ask you one more question:
I really didn't know this ".ＥＸＥ" file was a self-extracting file, thanks for pointing it out.
But after extracting it, why do the extensions become things like "ＤＯＳＳＨＥＬＬ.ＥＸ_, ＤＯＳＳＷＡＰ.ＥＸ_......"
And after I changed the extensions, such as changing it to "ＤＯＳＳＨＥＬＬ.ＥＸＥ", it displayed the DOS icon normally
again. So after self-extracting files under DOS are extracted, do the extensions all become like this? If I don't change them, what effect will it have?

１. Enter DOS.
２. Create a directory, X:\ＳＵＰ６２２
３. Put SUP622 into it.
４. Go into Ｘ:\ＳＵＰ６２２, and run the ＳＵＰ６２２ self-extracting file.
５. Still in that directory, run a batch file named ＳＥＴＵＰ.ＥＸＥ.ＢＡＴ.>>>>ＯＫ


Sorry, I ended up asking and answering my own question, but I found the ＤＯＳＳＨＥＬＬ and ＭＩＲＲＯＲ commands in there pretty
fun, so I'll try them out.