in reply to Problems in Using FindWindowLike Function

Modules with names of operating systems (or classes of operating systems) in their name most likely only work on their respective operating systems. For example the Win32:: modules likely only work on the family of Windows operating systems.

So you will need to either switch to Windows for your program or maybe use X11::GUITest. You haven't told us what problem you're trying to solve, so it's hard to give you more specific help.