Thank you for fast answer!
The file should be in the <gameinstallfolder>/CD2/Data
And it is.
The file should be in the <gameinstallfolder>/CD2/Data
Here it is how it looked initially, the path at least is as expected.
HD0:=C:\BGII - SoA CD1:=C:\BGII - SoA\CD1\ CD2:=C:\BGII - SoA\CD2\;C:\BGII - SoA\CD2\ CD3:=C:\BGII - SoA\CD3\ CD4:=C:\BGII - SoA\CD4\ CD5:=C:\BGII - SoA\CD5\
Note that DATA/AREA040D.bif is not the only area file missing.
For you first BWP install i strongly suggest to use BWS with "Minimum" components list.
I used to play with weidu mods some years ago, before BWP emerged. Now it's all or nothing