Untarring a file problem

Hi Folks;
Tried to untar a .tgz file with the following results:

clay@linux:~> file ac3d3linuxtrial.tgz
ac3d3linuxtrial.tgz: gzip compressed data, deflated, last modified: Wed
Oct 11 08:32:32 2000, os: Unix
clay@linux:~> tar -xvfz ac3d3linuxtrial.tgz
tar: z: Cannot open: No such file or directory
tar: Error is not recoverable: exiting now

Using ls on the file resulted in:

-rw-r--r--    1 clay     users     1512801 Jan  1 09:36 ac3d3linuxtrial.tgz

Any help would be appriciated.

TIA
Clay Stapleton