[agracier]

To get the mapsize.txt file, you should first simply create a regular txt file with that name. It should contain the following 2 lines:

# Size of map y direction in meters
24960.0

The last number will depend upon the size of the map_t or map_h you are extracting from. So for the map you are trying the extract the actors from, find the height in pixels. Not the width, but only the height.

Let's say for example that the height of the Hankow map_t in pixels = 1248.

Now multiply 1248 with 200 which gives 249600

Then add one decimal point before the last digit. It will then become thus: 24960.0

That is the number you should fill in for the mapsize.txt.

Place the file in the following locations .../Z_Actors_Management/MW_Statics/ ...

and also in

.../Z_Actors_Management/MW_Statics/Base_Files/ ...

It's possible one of the 2 locations is superfluous, but whatever.. It works for me.

When extracting from a new map, don't forget to change the mapsize.txt file accordingly.
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condensed version:

find height of map_t in pixels
multiply by 200
add a decimal point before the last digit / in other words, reduce the number to 10% of its original size.