# lhs2tex include file extension

We are using lhs2TeX in a big project. Thus we have many (executable) documents. We have a common .sty file and we also have a common file in which we keep all the often used lhs2TeX directives e.g.

%format alpha = "\alpha"


I have given this file the suffix of .l2t but is there a common / better suffix?

There's no required suffix, but lhs2TeX itself uses .fmt as a suffix for this sort of file.