Most zip files are meant to be opened from your PC, then install/transfer the files or application to your BlackBerry. If someone sent you a perosnal zip file and you wanted to open it on your BlackBerry, you will need a 3rd party application called "Ziplorer".
Posted from my CrackBerry at wapforums.crackberry.com
CrackBerry is in no way Affiliated with BlackBerry. We take pride in our unbiased content, however do occasionally receive free products from vendors that we review or discuss. For more info click here.