How to access/edit information about included audio files? I have a blend file that is supposed to be packed with a few wav audio files, but it seems the author forgot to pack them, and I don't have the files, if I try the option File>External Data>Pack into blend file blender shows the error: 

Unable to pack file, source path '//long path/something.wav' not found

I've found the library where those files were originally downloaded, and downloaded the required files, now I want to edit the information in the blend file so that blender can find those files.
You can edit the file path of the Sound Datablock (and any external file) using the Outliner:




From the header, make sure the outliner is set to display 'Datablocks'.
Browser to the Sounds section and find the sound datablock you want to edit.
Expand the RNA and modify the File Path string as required.
You might have to restart Blender to force a reload.