You need to create a new resource (folder).
Inside this folder you need to create another folder called stream and “__resource.lua” file with this inside:

resource_manifest_version '77731fab-63ca-442c-a67b-abc70f28dfa5'
this_is_a_map 'yes'

Now u can import files from dlc.rpf file to stream folder (to open .rpf file you’ll need open iv software)