The file is typically an "RPF" (Rich Pixel Format) file, which is a specialized 3D image sequence format often used in video post-production. It contains not just pixel colors (RGB), but also 3D scene data like depth (Z-depth) , surface normals, and motion vectors.
Select the and click on your composition to type your text. tracer_effect.rpf
If you have a tracked camera from the RPF file, your text will now move relative to that camera. The file is typically an "RPF" (Rich Pixel