The RWR Inkscape extension is used for exporting the heightmap, terrain splat maps and map view related stuff primarily these days. It's shipped with the game in installation_folder\tools\inkscape. No zip files are needed with exporting.
The exporter picks up splat maps based on Inkscape layers named as alpha_*. Map view stuff gets currently picked up for exporting from layers named as map_view_decoration on root level, and woods*, objects*, walls* and rocks* inside each layer*.
Depending on which vanilla map you're using as basis and what kind of changes for the terrain layers you've made, or if you're creating a custom one from scratch, you may need to adjust process.bat to fit your terrain splat maps, mostly in naming files. Process.bat basically applies a bit of blurring for the splat maps (without having to have blurring enabled in Inkscape at all times) and converts the heightmap to Greyscale which is what RWR requires.
Process_post.bat is used to combine max 4-layers of splat maps into one image, using it allows terrain rendering to be done in one pass instead of many. The game always attempts to locate terrain5_combined_alpha.png first; if it's not found, the old rendering method is used. Also, if you have more than 5 layers (base layer + 4 terrain layers), the old rendering method is used.
Process_map_view.bat is used to ultimately create map.png from the map view related exported stuff and a bunch of helper images. This is what you see when you press TAB in game.
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