How to change to window mode?

[GAGA Extrem]

For the regular version of the game settings are stored in:
USERNAME\MyDocuments\Paradox Interactive\Victoria II\settings.txt
Shouldn't be different for the steam version.

Try to manually open the file and change the line:

fullScreen=yes

to

fullScreen=no


You can change:

size=
{
x=1440
y=900
}

to change the default window size.