How to create .fchk files
To create fchk files to be opened by GaussView and represent orbitals ... you need the formchk utility (http://www.gaussian.com/g_tech/g_ur/u_formchk.htm)
To transform chk file to fchk: In ICIQ clusters: For Kimik2; you need to add the following line in your .bashrc or .bash_profile
PATH=$PATH:/opt/G09/g09
save it, and execute ". .bashrc" or ". .bash_profile". For kimik, and G03 the corresponding lines is PATH=$PATH:usr/local/g03.C02/p03
In CESCA: