It seems you’re looking for a guide on handling dictionary files, specifically those with names like drae-24.2.bz2.bz2 (likely a double compression or naming quirk).
It might be a single dictionary file compressed with bzip2 : stardict drae 24 2 bz2 bz2
Given this, it seems like you're looking at a StarDict dictionary file for Spanish, specifically based on the Royal Spanish Academy dictionary, version or edition 24.2, compressed with bzip2. StarDict It seems you’re looking for a guide
For (modern choice), point it to that folder or use ~/.goldendict/content . version or edition 24.2