Hi @Adam_Piekarski,
DoP files are not a supported format that Roon can read at the present time. For the current list of supported file formats, please refer to our FAQ Knowledge Base Article.
Since this appears to be "working as designed" I would recommend also posting your suggestion in the Feature Request section of the site.
Our product team and developers keep a close eye on that category, so that’s definitely the best place to propose a change like this and get feedback from the Community.