Welcome to MSP Librarian.
If you want to browse through the content of an MSP file then this might well be the place for you.
The functions that have buttons (in the app) are pretty self explanatory, such as Open, Add and Save.
For the rest of it there are bits of functional explanation in this Wiki.
Enjoy.
The Main Things
Other stuff
Settings
Plugins
Blog: 2020/08/plugins-crash-the-appdont-work
Wiki: Block Data
Wiki: Edit Entry
Wiki: Edit Settings
Wiki: Edit, New, Duplicate, Delete
Wiki: First Use Pages
Wiki: Grid
Wiki: Library Load Stats
Wiki: MSP Librarian Data Structure
Wiki: Menu Bar
Wiki: Move Entries
Wiki: Normalise Intensity Plugin
Wiki: Open, Add, Save
Wiki: PQI LIMA Plugin
Wiki: Plugins
Wiki: Recent File List
Wiki: Screen Layout
Wiki: Search
Wiki: Sending links to the Internet
Wiki: Settings