thats what is dose with the setup files i guss. I was dual booting with XP and 7 installed 8 to a seperate partition tried it did not like it fired up msconfig made 7 defalt, deleted the entry for 8 made the changes perminent and reformated that partition so 8 is gone forever. I can install again because i put the setup files on a USB key to install it the first time.
Okay, now I understand, the 2.62GB file is most likely the bootable USB image file that is used to create the USB thumb drive &/or installation DVD. Windows does seem to keep the file on the drive after the thumb drive is built, I have the same thing on my drive after building a new USB installation drive. Other than being large & in a hidden folder, there's nothing special about the file.
I thought you were talking about the setup files left in the Windows 8 partition that Windows 8 uses in its automatic self-repair mode in the event of file corruption or other failures. A neat feature of Windows 8, but it still needs improvement.