Herewith, a list of tickets related to encoding problems.  Think of it as a "poor man's FAQ" about character encodings and Fossil.  Reading these may help answer some questions before you have to ask them...
<blockquote>
<table>
<tr>

<td>Incorrent handling of unicode encoded files (fossil on win XP).</td>
</tr>
<tr>

<td>problem showing diff view with several files, each in different encoding.</td>
</tr>
<tr>

<td>Wiki edit textarea display and Wiki name does not support non-ASCII word</td>
</tr>
<tr>

<td>file extracted from Fossil zip archive could have different name</td>
</tr>
<tr>

<td>Support for non-UTF encodings</td>
</tr>
<tr>

<td>Unicode support</td>
</tr>
<tr>

<td>Non-ASCII characters not allowed in wiki page titles</td>
</tr>
</table>
</blockquote>