That's not the answer in that the wav, ogg and m4a files have all been imported into the programs and, for testing, I was using the sound files provided with Construct 2. The sounds work fine when the program is played through the Run Layout option of Construct 2 which incidentally uses IE10 as the default browser. So, when run locally, it works fine but when run through GoogleDrive as a host the sounds do not work when using IE.
So, I guess that it's beginning to look like the Google server is to blame huh.