Try it out yourself, by creating a test schema called "Personal stöff" and a table in it called "My däiary". Then create a text column and make it PK and then add the text "This is supposed to be ignored.". Then try to run this command:
pg_dump --format plain --verbose --file "C:\test.txt" --exclude-table-data="Personal stöff"."My däiary" --host="localhost" --port="5432" --username="postgres" --dbname="TestDB"
Just to avoid wasting time, when the command doesn't work at all, it outputs things like this:
pg_dump: [archiver (db)] query failed: ERROR: invalid byte sequence for encoding "UTF8": 0xf6 0x72 0x66 0x72
pg_dump: [archiver (db)] query was: SELECT c.oid
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n
ON n.oid OPERATOR(pg_catalog.=) c.relnamespace
WHERE c.relkind OPERATOR(pg_catalog.=) ANY
(array['r', 'S', 'v', 'm', 'f', 'p'])
AND c.relname OPERATOR(pg_catalog.~) '^(table name)$'
AND n.nspname OPERATOR(pg_catalog.~) '^(schema name)$'