Hello,
I wanted to use Neko Project 21/w with LaunchBox but noticed that unfortunatey NP21/w doesn't have the command line options to automatically launch HDI-based games or games with CD, etc.
For this reason I have created this small AutoHotKey script https://gist.github.com/bitgamma/acb3001732ba722feb4bc0539941e133
You should place it in the same folder as the np21/w (better if you compile it to .exe first using Ahk2Exe) and configure LaunchBox to use it instead of the emulator. You should leave the command line parameters to the default, and generally import the hdi file (if available) or the hdm file in your library.
The script will automatically generate an appropriate ini file for the game and launch it. To do this, it makes a few assumptions (which generally hold if you use games from Neo Kobe collection, at least those I tried out)
HDD extension is .hdi
FDD extension is .hdm
CD are in .ccd/.img/.sub format
It expects all files related to the same game to have the same exact name, save for the file extension. As long as they follow this rule, they will be automatically found and added to the ini file as needed.
Additionally, if you create an empty file with the same name as the game, but with the .25 extension (for example Rusty.25 placed next to Rusty.hdi), it will set the GDC speed to 2.5mhz instead of the default 5.0mhz. This is needed for some games.
This script has been developed for personal purpouses and isn't meant to cover any use case other than mine. I am posting it in the hope it will be useful to someone, either as-is or as a basis for further adaptation.