[OS X TeX] Perl, OS X, UTF-8 and TeXShop

[stephenmoye at cox.net]

I have written a perl script that takes legacy Textures documents and makes 
them into XeTeX-ready files (\"o => ö and the like). The new documents 
created by perl open with the now-very-tiresome warning:

"This file was opened with MacOSRoman encoding... blablabla".

What is TeXShop looking for? Is there some way in perl (I am a novice as yet) 
to write a file that is UTF-8 compliant?

Thanks in advance for any insights on this.

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