windows 7 - Delete contents of multiple folders except for specified files?

How do I delete the contents of multiple folders except for specific files?

For example, I have multiple folders which contain the same files, as below:

Folder1:

• File1


• File2


• File3

Folder2

• File1


• File2


• File3

Folder3

• File1


• File2


• File3

Etc.

I want to delete all files from each folder, except for File1 and File3. Can I do this with Powershell?

EDIT 1

Thank Crom! You guys are awesome!! We've figured out how to delete the files. However, I forgot to mention that I need to delete other folders also.

For example, here is what my folder structure looks like.

C:\Users\myname\Desktop\project1\english\folder1\file1
C:\Users\myname\Desktop\project1\english\folder1\file2
C:\Users\myname\Desktop\project1\english\folder1\file3
C:\Users\myname\Desktop\project1\english\folder2\file4
C:\Users\myname\Desktop\project1\english\folder2\file5
C:\Users\myname\Desktop\project1\chinese\folder1\file1
C:\Users\myname\Desktop\project1\chinese\folder1\file2
C:\Users\myname\Desktop\project1\chinese\folder1\file2
C:\Users\myname\Desktop\project1\chinese\folder2\file4
C:\Users\myname\Desktop\project1\chinese\folder2\file5

Goal: Delete everything except the following:

C:\Users\myname\Desktop\project1\english\folder1\file1
C:\Users\myname\Desktop\project1\chinese\folder1\file1

Answer

You could do something like this in PowerShell:

$toKeep = "File1", "File3"
gci startFolder -Recurse | ? { !$_.PSIsContainer } | ? { $toKeep -notcontains $_.Name } | remove-item -WhatIf

Remove the -WhatIf when you are satisfied it will do what you want it to do.