In the meantime, try https://github.com/krzys-h/UndertaleModTool
Tool for manipulating Game Maker Studio data files.
Powered by rgmk.
gmktool is written in Rust. You need to install the latest Rust nightly release.
Once you have done that, you can build gmktool with cargo build --release
gmktool 0.1.0
Tool for manipulating Game Maker Stdudio data files
USAGE:
gmktool [FLAGS] <DATA_FILE> [SUBCOMMAND]
FLAGS:
-b, --backup Create a backup (.bk) before writing to the data file.
-h, --help Prints help information
-V, --version Prints version information
ARGS:
DATA_FILE The game maker data file to operate on
SUBCOMMANDS:
help Prints this message
strings Manipulate strings
textures Manipulate textures
# Dump strings to strings.txt
gmktool data.win strings dump strings.txt
# Now edit them with a text editor or something.
# And finally, repack the strings
gmktool data.win strings repack strings.txt