Using OSX 10.6.8, Railcraft's sound files are being placed into /Applications/resources/* instead of /Users/me/Library/Application Support/minecraft/resources/* like all of the rest of the mods/vanilla do.

They are being placed anywhere the JVM is being run from, because they don't have a proper parent folder selected.

It actually only happens with the MC Official Launcher. MultiMC and Magic Launcher set the working directory correctly.