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I sometimes need to rename a group of files such as 39-1.docx, 39-2.docx, 39-3.docx, 39-4.docx, 39-5.docx, & 39-6.docx

so that all of these files will have another character after the last character of the file name such as b.

That would rename all of the files listed above to 39-1b.docx, 39-2b.docx, 39-3b.docx, 39-4b.docx, 39-5b.docx, & 39-6b.docx.

What is the correct command line command to do this from the Windows command line?

Hello,

           From a Windows command line you can use the command REN or RENAME with a wildcard to add the b.
All files must be in the same directory.
For example:

From WIndows run CMD
Once in command line, CD<directory> (this is the name of where your files are saved)
Once in the directory, REN 39-*.docx 39-*b.docx (the star will find all files that match the preceding string and allow for the same beginning name info plus add the b)