Getting archived files

I am still having trouble receiving archived files. I used the
GET command for Arc-1-92.Z. I saved the message I received to a
file. After stripping off the mail header and trailer info, I
had a data set of 623 rows and 61 columns. I downloaded this as
a binary file to my SUN IPX. When I tried to uncompress this
file, I got the message:

Arc-1-92.Z: dataset not in compressed format

Any help would be appreciated.

Dan Hough
Oklahoma Biological Survey