Rachel finds out that Ross never actually filed the paperwork for their annulment, meaning they are still legally married. Technical Note: x264-SONIX

Since you're looking for this particular episode, here is a quick breakdown of what happens in that chapter of the show, along with some context on that specific file format: Episode Recap: "The One Where Joey Loses His Insurance"

The string dvdrip x264-sonix-1 refers to a specific digital copy sourced from the original DVDs.

This indicates the source material was the physical DVD box set, which often includes the extended versions of the episodes that weren't seen on original TV broadcasts or modern streaming platforms like Max.

If you are looking to watch this legally, Friends is currently streaming in HD on Max (formerly HBO Max). The streaming versions are remastered in 1080p, though they usually use the shorter broadcast edits rather than the extended DVD versions.