A Dark Theme for Fusion360, because Autodesk is too lazy to make one
Back up original files before replacing them (e.g. rename as .bak) to avoid issues and a full reinstall.
Base folder is
C:\Program Files\Autodesk\webdeploy\production\{currentID}
or according to #2
%LocalAppData%\Autodesk\webdeploy\production\{currentID}
{Base}\OfflineJS\OfflineJS.zip
{Base}\Neutron\UI\Base\Resources\ActionMenu\style
{Base}\Neutron\UI\Base\Resources\CSS
Base folder is:
/Users/{username}/Library/Application Support/Autodesk/webdeploy/production/{currentID}/Autodesk Fusion 360.app/Contents/
Note: to access subdirectories inside the application, right click Autodesk Fusion 360.app
and "Show Package Contents".
{BaseFolder}/Resources/OfflineJS/OfflineJS.zip
{BaseFolder}/Libraries/Neutron/Neutron/UI/Base/Resources/ActionMenu/style
{BaseFolder}/Libraries/Neutron/Neutron/UI/Base/Resources/CSS