How to remove .resS files?

I’m quite new to making games, I made some 3d then imported as “.obj” to unity editor. After the game was made the mesh size became small and I saw there was a “.resS” file whose name duplicated the “.asset” file, strangely if I compress the mesh there is no “.resS” file and only the “.asset” file.

if you know how to remove the “.resS” file without compressing the mesh please tell me!