Unable to read zipped up xlsx files

I was supposed to recieve a zipped xlsx file from a friend,but when i

recieved it , i noticed that it was all broken up into xml files and i

am open to read it as an excel file .i have installe the file converters

for office and even tried different versions of winzip but when i ask

my friend to send the files to me and to another friend i was unable

to open but the other was able to .Please help