Check scirra.com/forum/forum_posts.asp thread, and especially the response from Ashley, to see if this helps you resolve your problem.
Thank you for your reply: I've read the thread about the sound problems.
I removed java and installed java 64-bit again on my computer to export the model comes with construct 2 (Space Blaster) : sound works on Firefox and IE (does not work on Chrome) locally.
When I put the files on the server, making sure that the MIME types are sent, I have no sound at all.
Or i'm sure I OGG M4A and online ... <img src="smileys/smiley11.gif" border="0" align="middle" />