unicode char causing troubles within subfiles [duplicate]

Question

I have an issue that only happens when I try to sepparate my latex code in many subfiles. If I let all the "special characters" in the main file, there's no problem, but if I move them to a subfile and then import it. It cannot compile because of an error described by the compiler as:

 pdflatex> ! Package inputenc Error: Unicode char \u8:ícl not set up for use with LaTeX.

This is a minimal example that works:

\documentclass[a5paper,oneside]{amsart}
\usepackage[utf8]{inputenc}
\begin{document}
    cíclico
\end{document}

This is a minimal example that doesn't work:

\documentclass[a5paper,oneside]{amsart}
\usepackage[utf8]{inputenc}
\begin{document}
    \input{file1.tex}
\end{document}

Where file1.tex only contains:

cíclico

Answer 1

Well, the problem was my IDE (TeXnicCenter) along with my OS (Windows 8). TeXNicCenter was saving the files with an encoding different from utf8. What I did and worked is, delete the "subfiles" create them again with TexMaker, save them and then it compiled without problems. So now, my question is reduced to this one: How to change the text encoding of a TeXnicCenter project?