Anyone still interested in source viewer plugin?
Files go to
SciLexer.dll
/system
dosv.dll
C:\Program Files\GPSoftware\Directory Opus\Viewers
dosv.config.xml
/dopusdata/ConfigFiles/Plugins
You may also need:
Visual C++ Redistributable for Visual Studio 2012
http://www.microsoft.com/en-us/download/details.aspx?id=30679#
dosv.zip (1.24 MB)