[MCL-5294] Cannot set other AppData directory

Mod Edit

We always intended you to use --workDir /path/to/wherever, I didn't know so many people were using the APPDATA workaround. We can't support that going forward, so you'll just have to use the command line argument sorry!

– [Mojang] Nathan Adams

I have been running Minecraft with a changed appdata directory for ages now as I don't want it to store settings, worlds and other data on the normal AppData folder of my system drive. This doesn't seem to be possible anymore, it simply ignores the changing of the variable.

Batch script used:

Minecraft.bat

set "APPDATA=%~dp0"
start MinecraftLauncher.exe

Where %~dp0 automatically gets replaced with the current directory that the batch file resides in but it doesn't work with a full path either.

I've reported that error before when the testing launcher was released but it seems that it went below the radar.