When trying to launch xsetup within a Linux OS I receive the following error:
root@machine_name:Xilinx_ISE_DS_13.4_O.87xd.3.0> ./xsetup
./xsetup: Exec format error. Wrong Architecture.
This issue is caused by uncompressing the tar file incorrectly.
Make sure that you use the following command to uncompress the download.
tar xvf Xilinx_file.tar