Samsung wave 2 excel file unable to open file error.

Hello techyv,
Samsung wave 2 excel file unable to open file error. I downloaded an excel file with an extension of .xls from an email, I am using my Samsung wave 2 phone when opening those files. Unfortunately those files are unable to open. What will be the best solution for this problem? I need to open those files using the mobile phone.
Expecting some help from you guys.
