Path Actions adds a folder button to the top-right of Blender's header. A simple click opens the current blend file's folder in your operating system's file browser. Modifier keys extend the button: Ctrl+Click copies the blend path, Shift+Click opens a Side Blend list, Alt+Click reveals alternative actions, and Ctrl+Alt+Click brings up a formatted-path copy popup.
The Side Blend menu lists other blend files in the same folder, letting you open one in place, launch it in another Blender instance, or copy its path. The Alternative actions menu covers a multi-version file history, copies of app-related paths for the blender-app, config, temp and script-directories folders, the executable path, and shortcuts to open or search the addon folder.
In the file browser, buttons open the browsed folder in the OS explorer or point the browser at the blend's location, and search operators toggle the output path between relative and absolute. A developer mode adds a full blend-reload button and a link checker that lists external files and edits library filepaths.