Possible to rename files according to a pattern?

Looking for a way to do this in an installer. Two different scenarios (not sure if it makes a difference in execution):

  1. Bulk renaming files (e.g. removing a prefix from the file names). In this case I know the file names and could rename each one individually, but that’s a pain.

  2. Renaming a file to remove characters that might not display correctly due to encoding problems. In this case I can’t specify the full file name because it might not be recognized, but I could point to, e.g. *start.exe instead of ゲームstart.exe.