Reaper (apparently) looks for the whole path of the file. If the project is stored in: G:\Audio\MyReaperProject and you move the whole shebang to: C:\Audio\MyReaperProject it won't find the audio files, at least if they are in subdirectories. Unless there is something obvious I am missing. Conversely, once you locate the files, save the project and move the latest version of the project back to its original location, it won't find the audio files again. J