Setup Playnite for multiple computer or user accounts.
This command may be helpful
subst G:\ C:\path\to\game
This convert C:\path\to\game
folder into a dedicated G:\
drive
subst /D G:\
Undo the changes
Might require a restart, more reliable option
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\DOS Devices" /v G: /t REG_SZ /d "\??\C:\Partitions\G" /f