<p>Indeed, because even if Geany's <em>filetype_extensions.conf</em> list <code>*.htm</code> under <code>HTML</code>, the patterns are case sensitive so won't match <code>foo.HTM</code>.  We could add various uppercase variants including <code>HTM</code> and <code>HTML</code>.</p>
<p>PS: and no, just being case insensitive is not really an option, as some extensions are case sensitive, like <code>.C</code> which is C++, but <code>.c</code> is C.  Maybe we could consider as an option to perform a second case-insensitive pass in case we didn't find a match.</p>

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