Powershell change extension

Question

I have a problem with change extension of a file. I need to write a script which is replicating data, but data have two files. Filename is not a string, so we can't use normal -replace

I need to get from

filename.number.extension

this form

filename.number.otherextension

We try to use a split, but this command show us things like below

filename
number
otherextension

Thanks for any ideas,

Answer 1

[System.IO.Path]::ChangeExtension('test.old', '.new')