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# Description This extends the documentation on the commands `open` and `save` can run under the hood, and explicitly lists those, based on the current user environment. Also see [this discord thread](https://discord.com/channels/601130461678272522/988303282931912704/1364930487092777020) # User-Facing Changes Users will be able to see the list of commands that `open` and `save` can run, and the extensions that each command is run for, in `help open` and `help save` respectively: ## `help open`  ## `help save`  # Tests + Formatting All pass except for the ones that don't (and never did pass for me before). # After Submitting No updates needed.
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.