Is it safe to delete config.msi in my root drive?

I’ve been wondering if it is safe to delete config.msi folder in my root drive of my windows. I’ve open the folder and found out that there are some files with the extensions of .RBS and RBF. What are those files by the way? I tried to delete the file but before that I save a backup of them in my USB flash drive just in case an error will occur on my computer system. So far I haven’t encountered any errors, my computer seems to work normal as before. But for precautionary measure I haven’t deleted the backup files yet, as long as I’m not sure of what the files are for.
