One sound, one card.
Packs often ship one loop as several files: the audio, the MIDI behind it, a dry version, a second take. Libreria puts files that share a name on one card, so you look for a sound, not for its files.
Click a sound and it plays. The waveform and the notes are drawn from the files themselves. MIDI plays through a small built-in synth and drum kit, or through a SoundFont of your own.
Then drag it into the song.
Drag a sound from the list into your DAW, and the original file lands on the track. Nothing is copied, converted or exported on the way.

A pack with one sound playing: the audio on top and, under it, the MIDI from the same card. The rows marked MIDI are cards that have both.