Can't restore my distribution DB postgres 9.2 backup into my staging DB postgres 9.3
I found several bug reports indicating that pg_dump has problems writing to a pipe on Windows:


BUG #7794: pg_dump: errors when using pipes/streams
BUG #6726: pg_dump - ftell mismatch when using -Fc and split


Instead of writing to stdout and redirecting to a file, try using -f specify the output file:

pg_dump -Fc -U "username" -w "dbname" -f "filename".dmp