XML error- switch from current encoding to specified encoding not supported

Hello to all,

I'm trying to use an XSD schema to produce an XML file but i'm receiveing the a.m. error when i open the XSD file.
The error occurs in the following line:

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I've been googling around to find a solution for the problem but was unable to find it.
Can someone please give me some help on this.
Thanks a lot for any kind help.
Octavio

Answering to myself:
I was able to solve the problem by using Notepad and saving the XSD source text with UTF-8 encoding.

Octavio