Download cool cell phone music player, the dog that did not support the format, how do

I downloaded a cool dog mobile music player, but can not open that format is not supported, how does this matter? I use Nokia7100s

Make sure you download the cool dogs.Sis or.Sisx format , and other formats are not supported.then determine whether you download the cool dog sign, if it is.sis format as unsigned, need to be signed to install, if it is.sisx format is signed off, but the signature date may need to re- sign.

Thank you