<blockquote>
<p>Does this completely override a normal language file or does it use a normal language file and then apply the changes listed on top?</p>
</blockquote>
<p>It lets you create own new filetype, based on built-in lexers(highlighting) and parsers(symbols).</p>
<blockquote>
<p>Is the documentation there simply out of date?</p>
</blockquote>
<p>It's in the regular <a href="https://www.geany.org/manual/current/index.html#filetype-configuration" rel="nofollow">filetypes documentation</a>.</p>
<blockquote>
<p>What am I missing out on with a custom filetype compared to an actual language file?</p>
</blockquote>
<p>For something as simple as assembly, probably not much. If the assembly dialect had weird syntax (compared to "traditional" assembly) then some stuff might be mis-highlighted or show up wrong in the symbols sidebar.</p>
<p>The alternative is to write your own lexer in C++ and own tag parser in C and integrate it into the 3 related projects (Scintilla, Ctags and Geany).</p>

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