If vim does not detect a filetype correctly, then you can add a modeline at the top of the file (first or second line, I think), which tells vim the filetype. For example, when the tex class file mycv.cls was incorrectly detected (as a Java class file, I presume), I added the modeline
% vim: set filetype=tex : right at the top. This resolved the problem. Do a
:help filetype for more info.
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