A PowerShell script to rename your files with DOS-compatible (8.3) filenames.
The default behavior is to propose name changes with ~ followed by a number. It can handle large directories containing many files.
PS C:\Users\test\dosnametest2> C:\Users\test\Documents\dos-renamer.ps1
Original Name DOS Compatible Name
------------- -------------------
New Text Document - Copy (10) - Copy - Copy - Copy - Copy - Copy.txt New Te~1.txt
New Text Document - Copy (10) - Copy - Copy - Copy - Copy.txt New Te~2.txt
New Text Document - Copy (10) - Copy - Copy - Copy.txt New Te~3.txt
...
New Text Document - Copy - Copy.txt New Te~997.txt
New Text Document - Copy.txt New Te~998.txt
New Text Document.txt New Te~999.txt
Do you want to rename the files as proposed? (Y/N): y
PS C:\Users\test\dosnametest2> dir
Directory: C:\Users\test\dosnametest2
Mode LastWriteTime Length Name
---- ------------- ------ ----
-a---- 5/29/2024 7:34 PM 0 New Te~1.txt
...
-a---- 5/29/2024 7:34 PM 0 New Te~999.txt
It also can take a switch --hex which will propose hexadecimal values and not use the ~ character:
PS C:\Users\test\dosnametest2> ..\Documents\dos-renamer.ps1 --hex
Original Name DOS Compatible Name
------------- -------------------
New Text Document - Copy (10) - Copy - Copy - Copy - Copy - Copy.txt New Te01.txt
New Text Document - Copy (10) - Copy - Copy - Copy - Copy.txt New Te02.txt
New Text Document - Copy (10) - Copy - Copy - Copy.txt New Te03.txt
...
New Text Document - Copy - Copy.txt New T21E.txt
New Text Document - Copy.txt New T21F.txt
New Text Document.txt New T220.txt