changes every flag to match the historical flags. Germany and Japan are given their army flags rather than state flags. communist china is given the flag of the chinese soviet republic. switzerland and nepal have black on their flags because of the transparency
to install, just extract the file and drop the Historical Flags folder and Historical Flags.mod file into the hoi3 mod directory ( [game install location]\Hearts of Iron III\mod )
if it doesnt work, clear your flag cache in C:\[user]\Documents\Paradox Interactive\Hearts of Iron III\gfx