[opengrok] How to add more file extensions (file types)

[Jim R. Wilson]

Hi all,

I'm using OpenGrok to index a codebase containing a variety of files,
some of which have the extension ".sln" which are being treated as
binary files.  That is, they are unsearchable.

Is it ctags responsibility to interpret these files? or is it an
OpenGrok setting?  How can I tell OpenGrok that *.sln should be
treated as plain text?

Thanks in advance for any help.

-- Jim