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How can I convert text file to UTF-8 encoding ?
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In Notepad++ you can choose from menu: Encoding -> Convert to UTF-8.
How can I do it with Qt ?
Read the file, then open a new one and write the data using QTextStream set to UTF-8.
You can do this by getting the example from "QFile":http://qt-project.org/doc/qt-5/QFile.html documentation, and combining it with "QTextStream":http://qt-project.org/doc/qt-5/qtextstream.html#setCodec-2.
Once the new file is ready, close it, delete the original and move the new one to the old position.