The qsoundhle.zip should stay zipped and be placed directly in your /roms folder alongside your games. Do not unzip it.
Arcade ROMs are finicky.
Wait, I should confirm if "fixing" here refers to a community patch, maybe from GitHub or a mod, or an official update from the Dolphin team. Also, the ".zip file" part suggests that the fixed plugin is distributed as a zip archive. So the post should guide users on where to download it, how to install it, and the benefits. qsoundhlezip file fixed