I have a group of files in a folder named File0001, File0002, ..., File0150,
with two files per name (two different extensions). I want to rename all
files with an underscore before the number (File_0001, File_0002, ...,
File_0150). I tried:

rename File*.* File_*.*

The files were renamed to File_001, File_002, ..., File_150; it dropped one
of the leading zeros, wheras I wanted all digits retained. I also tried
replacing the first asterisk with four questions marks (rename File????.*
File_????.*); same result.

Can anyone tell me how to achieve the desired renaming?

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