When you load an audio file into ExpressScribe it does not copy the original file per se, but converts and loads into an uncompressed version of wav called "DCT"; I make a habit of using control delete within the ExpressScribe window when I am finished with my transcription, which will completely delete that dct/wav file, and ensure that the files don't accumulate and eat up my hard drive, even if there's little threat of that. Of course, the larger the original compressed file-- mp3, mp4, wmv, etc.-- the proportionately larger the uncompressed file will be. .
Otherwise, you should be able to find those files in Windows at
C:\Users\[username]\AppData\Roaming\NCH Software\Scribe\Current
if you just press "Done" the files are not deleted from the hdd unless you specify a number of days in the Scribe settings. You should be able to find those undeleted files in
C:\Users\[username]\AppData\Roaming\NCH Software\Scribe\Done
Hope that helps explain a bit more. KRN