Thanks for this one. It's been three years since your posts, but the bug hasn't been fixed. I just came up against it on a Win7 system with ActivePerl 5.10.0.
GetOpenFile works fine for me, so I'll just use that. Here's the documentation on getOpenFile. It comes with Tk, no install needed.

In reply to Re^3: Tk::FileDialog: can't make ".filedialog" its own master by elef
in thread Tk::FileDialog: can't make ".filedialog" its own master by Roy Johnson

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