.DLR File Extension
File TypefinalRender Plugin
What is a DLR file?
Plugin created by finalRender for Autodesk 3ds Max, a 3D modeling program for games, films and other motion graphics entertainment; contains features like shadow and atmosphere effects referenced by Autodesk 3ds Max.
In Windows XP, the DLR file can be found in the following directory:
NOTE: If you encounter an error message in Autodesk 3ds Max, you may have to remove all finalRender effects from your scene. You could also export the finalRender object(s) as a .3DS file and then import it back into your scene.