Sims 4:0x319E4F1D

Format

DWORD version
then commonblock

Sims 4:CatResCommonBlock

DWORD unk9 (always 01 00 00 00 in written order)
DWORD unk10
DWORD unk11
DWORD unk12
DWORD unk13 (always 02 00 00 00 in written order)
DWORD unk14
DWORD unk15

DWORD unk16_flags flag field I think
DWORD Category flags
DWORD unk17_flags some other flags
DWORD unk18_flags maybe flags
DWORD Placement flags

QWORD unk19 probably IID
BYTE unk20
QWORD unk21 probably IID
BYTE unk27

BYTE colors count
For colors
	DWORD (probably RGBA - alpha is definitely last as it's always FF in everything but glass)
	
BYTE unk22
BYTE unk23
BYTE unk24
BYTE unk25
BYTE unk26

BYTE buildbuy=00/buymode=01