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I have two comments on this.

Though I'm mostly a Linux developer, I've had to code
for Windows as well. The times I've been required
to code something that didn't need to be cross-platform,
the moment is was not cross platform it then needed to be.

i.e., if it could be Win-specific and I wrote it that way,
suddenly "Cross-Platform" was the new requirement.

That being said, I have also used Win32::GUI and did not
have a good time with it. Even on my Windows-specific
tasks I resort to using Tk. Ease of use and
documentation are my reasons.

Regarding doumentation, I found that Perl in a Nutshell
provided enough info to start with Perl/Tk.
Advanced Perl Programming finished off the topic,
so when I finally got around to reading the Perl/Tk book
I didn't learn very much. Still a good book though.

--
-Felonious