Boutell Player doesn't work in WordPress. Why?

Hello,

I got a little challenge here. I found a player with auto resume for wordpress ( tierra player with auto resume ). It works fine on localhost but as soon as I loaded it on the server the auto resume doesn’t work anymore, so I tried several other players with no luck.
I found the following player: https://www.boutell.com/newfaq/creating/audio.html and it works well in a simple html file, so I wanted to integrate it into the wordpress site, but it doesn’t work. What am I doing wrong? I don’t understand it, is there something I am not thinking off? I putted the following code

<object type="application/x-shockwave-flash" width="400" height="170"
data="xspf_player.swf?playlist_url=test.xspf">
<param name="movie" value="xspf_player.swf?playlist_url=test.xspf" />
</object>

into the header.php where it should be, but it doesen’t work. In the page.php neither. I putted all the code, swf and mp3 I needed in the same folder (theme directory with the theme I use) like I did for the simple html file. What went wrong? Am I stupid? ; )