How to hide files with a certain extension

[prototype_sx]

I want to know if there is a way to make all files with a particular extension invisible. I have my media organised from vista and there are certain eh files i'd love to be invisible in Leopard.

 

Please advise

[NeSuKuN]

there is a file I don't know which is which lists filename patterns that in case of match, are hidden in the finder, but don't ask mi where it is. search in google.