links to ppt don't work

Hello,

in my page http://www.specialmusiclass.com a lot of th links on some pages,don’t work.Instead of opening the linked file (ppt, mifi or sound) it just shows the code on another page.

When i tried deleting and re-loading the file and attaching it again,it still doesn’t work.

Any suggestions?

to see the problem,just click on the following:
http://www.specialmusiclass.com/ennoies_ixou/%CE%B7%CF%87%CF%8C%CF%87%CF%81%CF%89%CE%BC%CE%B1/ and click on the second image with the animals

or:

http://www.specialmusiclass.com/ennoies_ixou/%CF%84%CE%BF%CE%BD%CE%B9%CE%BA%CF%8C-%CF%8D%CF%88%CE%BF%CF%82/

click on the pink image below.

thank you!