error recovering pg_dump compressed file I produced this backup:

pg_dump -v -Fc -Z5 -f thebackup.dmp.gz thedb


I can't open the dump with gzip, 7zip... I could recover the same files in the past without using -Fc parameter. Is it possible that using -Fc and -Z5 might have corrupted the compressed file?
Just use pg_restore:


  pg_restore is a utility for restoring a PostgreSQL database from an
  archive created by pg_dump in one of the non-plain-text formats


Using -Z5 -Fc on pg_dump does not transform the backup into a gzip format. It adjusts the compression level, but the structure of the file is still the specific custom archive format that non-database commands like gzip or 7zip don't know.