Click on the field header labeled "Extensions" (to order the list by extension)
Scroll down and click on the entry for "ASX"
Click on the "Change Action" button
Select the top radio button labeled "Open them with the default application"
Repeat steps 6-8 for every instance of the ASX extension in the list. When you are done, click "Close" then click "OK" in the options window. Audio samples should now play properly in Windows Media Player.
The Opeth Collector's Box will be nothing more than a slipcase for true Opeth collectors. Essentially, Koch has licensed the albums Blackwater Park, Deliverance, and the acoustically based Damnation, added the double-live CD Lamentations: Live At Shepherd's Bush Empire set from 2004, and put them all in a slipcase for a semi-budget price. The hard thing for fans here is that the version of Blackwater Park included is not the 2002 edition which contained a bonus disc, but the original 2001 version. Still, these are all classic albums, and the live set smokes; it is molten hot. If you are into spending a bit of cash and are new to Opeth, this is a sure bet collection.