changing the friend chat window:
unpack interfaces.pck
go through all friendchat*.dtf files (friendchat0.dtf is a first opened window, friendchat1.dtf is second chat window, etc. pretty silly huh

) and change:
DIALOG "Win_FriendChat0" 0 0 260 300 ... -- 260 is window width, 300 is height
note that changing window size does not realign all controls so go further:
TEXT "Txt_Chat" "" "" 6 30 248 187 ... -- text window, x, y, h, w
EMOTIONEDIT "Txt_Content" "" "" 6 244 205 50 ... - text to send
STILLIMAGEBUTTON "Btn_Send" "send" "SFX\Interface\ClickB.wav" 212 269 42 24 ... - buttons
edit all this **** and do not forget to pack your changes back