You will likely find folders for Textures , FBX (3D models), or Prefabs if it is a game asset.
The file edwardfrill.7z appears to be a compressed archive, and "deep content" likely refers to the specific assets or data contained within it. edwardfrill.7z
The official, free software is 7-Zip , but other popular options like WinRAR or PeaZip also work. You will likely find folders for Textures ,
To view what is inside, you will need a utility that supports the .7z (7-Zip) format. FBX (3D models)
Right-click the file and select "Extract Here" or "Extract to edwardfrill/" .