/usr/share/budgie-desktop/keycontrol/custom-keys.d/visualspace-left.dconf is in budgie-desktop-environment 0.9.9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [custom-keybindings/budgie-visualspace-left]
binding='<Control><Alt>Left'
command='/usr/share/budgie-desktop/visualspace/visualspace prev'
name='Move to Workspace left'
|