[GENERAL] pg_dump throws too many command-line arguments in Postgres 10

In Postgres 10   Windows 

invoking g_dump exe with

pg_dump.exe -b -f b.backup -Fc -h  -U admin -p 5432 mydb

causes error

pg_dump: too many command-line arguments (first is "-p")
Try "pg_dump --help" for more information.

How to fix this ?
In earlier versions it worked.

Andrus


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