Version: defaultworldtype-1.16.3-2.0.2.jar
Minecraft: 1.16.5
Forge: 36.1.61
Default World Type: skyblockbuilder.custom_skyblock
Modpack: SkyQuesting Updated (a small pack for me and my friends)

Description
The mod generates a strange filename on Linux, defaultworldtype\world-types.txt. On Linux a forward slash is used to separate directories from filenames. This is not a breaking issue but now there is just a random filename between other config files and the file is not located in the defaultworldtype directory.

How to reproduce

1. Install the mod on Linux
2. Check the config directory for the file as stated above

Expected behavior
The file world-types.txt is being placed in the correct directory.

Screenshots
No screenshots.

Thanks for reporting.
This mod is client only and I recommend using the forge-common.toml to changing the world type in a modpack since 1.16.4. This will also work on servers.