It depends on the boot devices priority defaults in firmware. If CSM is enabled and loaded into memory, this can sometimes cause install media to default to Legacy MBR boot.
If you boot to legacy boot mode and go through installation you will typically have 2 partitions (as listed with diskpart.exe "list partition"). The first partition being active and listed as ‘system partition’, file system type being NTFS with a hidden \\boot folder. The second partition is where \\Windows is installed on another NTFS partition.
If Windows is installing in UEFI mode, installation will create the EFI System Partition (ESP) as file system type Fat32, the Microsoft Reserve Partition (MSR) as RAW, and an OS / data partition using NTFS. If you mount and look at the ESP, you should see a folder \\EFI boot folder (folder may be hidden).
Since you will need to leave CSM enabled in the system firmware for Windows 7, you may need to specifically select UEFI boot mode when booting to installation media (CD/DVD/USB) in order to install Windows 7 in UEFI boot mode.
Consult with PC manufacture for more information concerning boot options and BIOS configuration.