I have a series of filenames as follows

1.2.2
1.2.3
1.2.4

1.10.1
1.10.2

I would like to convert them to the following format

1_002_002
1_002_003
1_002_004

1_010_001
1_010_002

So basically, I need the second and third digits to have three characters in each and the decimal replaced with an underscore.

Thanks in advance.

I think I need to split the string into three and add leading zeros but don’t know how to do that in Powershell.