MS-DOS has several options for renaming files. This includes adding characters and removing them as needed. Beware that renaming is powerful and there is now going back. Make a copy of the files if you are unclear about using advanced MS-DOS techniques.
* is the wildcard for all characters, ? is the wildcard for one character. Wildcard characters (* or ?) may be used with either the first or second filename designation.
EXTENDING FILE NAMES
To add more characters to a file name is easier.
rename *.* 1992*.* name all the files to start with 1992.
LEFT TRIM FILE NAMES
To left trim characters is less well known:
rename "abcd*.txt" "////*.txt"
The / represent a character that is desired to be removed.
ren "[#???] *.txt" "///////*.txt"
This will only rename files that start with [# , have a ] and a space as the 6th and 7th characters and end with a .txt.