source vs binary

i would really appreciate some help on these two wuestions:
1) as suggested by many of you i ftp'd GohstView in the form
  of the file gsview11.zip: here is the rub, what is a zip file?
  I have tried moving the file to DOS and using PKUNZIP, which
  is the only thing i could think of, but PKUNZIP dosen't
  know what to do with the expanded files (litteraly) so it
  aborts. any thoughts (i didnt use UNCOMPRESS because its not
  a .Z file)

I would suggest grabbing the latest pkzip, pkz204g.exe wherever it is
available to you.

Ry
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