It seem the original link for fweep is no longer working. It used to be into this folder: zzo38computer.org/zmachine/
(edit: i found it there: ifarchive.org/indexes/if-arc … fweep.html)
Support for Fweep is no longer provided (and it contains a few errors; if you want them fixed you will have to do it by yourself). Either use the copy in the IF archive (without official support), or try using ZORKMID instead. Further fixes will be applied to ZORKMID, EZORKMID, XZORKMID, and YZORKMID.