Bat-files for "Waddle" for work with "A&A" Data.rwd. Download the programm by link below, unpack and replace original .bat-files by this two.
A small program that I found here. Download link.
Managed by two bat files. Unpack the program in a separate folder and put there your "Data.rwd" which you need to unpack. By clicking " wad-extract.bat" you will get a folder "Data" with unpacked files from "Data.rwd."
By clicking " wad-compress.bat " the contents of the "Data" folder are converted into a "Data.rwd" file (old file "Data.rwd", located in the same directory with "Waddle.exe" being replaced with a new one).
Works well. It can probably reduce the size of large mods without throwing out content from them and more organically include modifications in the game.
NOTE: Be sure to back up your existing RWD files before using this program (data.rwd, music.rwd, etc.) because improper use can ruin those files.