There is not yet a graphical UI to handle this but it can be
done nonetheless by editing the syntaxcolouring.xml file.
You can load the file in Ellié Computing Merge and
edit it (use XML pretty-printing feature to get it in a better
shape).
Each /syntax-colouring/lexer/association node contains an
extensions attribute, you can add or change
these extensions. For example, if you would prefer Hypertext
colouring scheme for .ASP file, you can do that:
search *.asp (the default scheme is
asp), remove the extension from the list
search language="Hypertext" and
add *.asp to the list of extensions
If you want another colour or change bold/normal
font for a style, you can have a look to the
style nodes under a scheme
(lexer nodes). The notation is the HTML
notation (i.e. a font tag, with color and bgcolor attributes,
use "bold=yes" for bold, italic="yes" for italic). Note that
background colours are ignored in differentiation mode, so as
not to interfer with differences background colours.
Ellié Computing
Merge takes its syntax colouring scheme in priority from user's
folder (search mergeconfig*.xml and put your modified copy of
syntaxcolouring.xml in the same directory), then from the
installation directory if user's version was not found. Doing
this will prevent the replacement of your modifications with
the base version during next upgrade.