Refactor file layer in scan #5156

Job	Run time
build (windows-2019, Win32, v142, 17, Debug)	1m 29s
build (windows-2019, Win32, v142, 17, Release)	1m 25s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 20s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 11s
build (windows-2019, x64, v140, 14, Debug)	1m 5s
build (windows-2019, x64, v140, 14, Release)	1m 12s
build (windows-2019, x64, v141, 17, Debug)	54s
build (windows-2019, x64, v141, 17, Release)	44s
mingw (mingw64)	2m 48s
mingw (ucrt64)	2m 58s
build (windows-2019, x64, v142, 17, Debug)	38s
build (windows-2019, x64, v142, 17, Release)	45s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	40s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	47s
build (windows-2019, x64, v142, 20, Debug)	1s
build (windows-2019, x64, v142, 20, Release)	32s
build (windows-2022, x64, v143, Debug, 20)	20s
	18m 49s

Provide feedback