Want to disable the built-in DDS plug-in

[kakkou]

Hello.
Built-in DDS plug -ins XnViwer has not been corresponding BC7.
Therefore I installed the user the following plug-ins .
https://github.com/kikuuuty/xnview-plugin_bc7
This was able to open a correctly BC7 file by specifying the format because you open the image .
But XnView can not be displayed from the association in order to open in the built-in plug-ins for extension DDS.
Will not how to disable the built-in DDS plug-ins ?