Win11 preferred: sparse package + IExplorerCommand DLL (shell/explorer_command; build with MSVC) — Install in-place, New Installer Project, New Installer CI pipeline under Ibex.
Fallback: classic HKCU cascading menu + .ibex type for older Windows or when modern registration fails.
macOS
Writes Quick Action instructions under ~/Library/Services.
Linux
DES-EMA actions under ~/.local/share/file-manager/actions/ plus a Nemo action.