How to run mysql on Windows through mysqld and not through a service?

Question

WAMP

Installed MySQL Server + Workbench using Windows Installer.
The server is started / shut down via cmd --> net start MySQL57 / net stop MySQL57
I would like to start it via mysqld. We try cmd --> mysqld --console starts up, shows that everything is fine. But when trying to connect any user, we have:
Access denied for user 'Program'@'localhost' (using password: YES)
In this case, if run through the service, then everything works. The log is attached.

2016-12-05T21:00:30.158923Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-12-05T21:00:30.158923Z 0 [Note] --secure-file-priv is set to NULL. Operations related to importing and exporting data are disabled
2016-12-05T21:00:30.158923Z 0 [Note] mysqld (mysqld 5.7.16) starting as process 4888 ...
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Mutexes and rw_locks use Windows interlocked functions
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Uses event mutexes
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: _mm_lfence() and _mm_sfence() are used for memory barrier
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Compressed tables use zlib 1.2.3
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Number of pools: 1
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Not using CPU crc32 instructions
2016-12-05T21:00:30.174548Z 0 [Note] InnoDB: Initializing buffer pool, total size = 128M, instances = 1, chunk size = 128M
2016-12-05T21:00:30.190190Z 0 [Note] InnoDB: Completed initialization of buffer pool
2016-12-05T21:00:30.292175Z 0 [Note] InnoDB: Highest supported file format is Barracuda.
2016-12-05T21:00:30.323440Z 0 [Note] InnoDB: Log scan progressed past the checkpoint lsn 2533304
2016-12-05T21:00:30.323440Z 0 [Note] InnoDB: Doing recovery: scanned up to log sequence number 2533313
2016-12-05T21:00:30.323440Z 0 [Note] InnoDB: Doing recovery: scanned up to log sequence number 2533313
2016-12-05T21:00:30.323440Z 0 [Note] InnoDB: Database was not shutdown normally!
2016-12-05T21:00:30.323440Z 0 [Note] InnoDB: Starting crash recovery.
2016-12-05T21:00:30.865237Z 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2016-12-05T21:00:30.865237Z 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2016-12-05T21:00:30.865237Z 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2016-12-05T21:00:31.152991Z 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.
2016-12-05T21:00:31.253463Z 0 [Note] InnoDB: 96 redo rollback segment(s) found. 96 redo rollback segment(s) are active.
2016-12-05T21:00:31.253463Z 0 [Note] InnoDB: 32 non-redo rollback segment(s) are active.
2016-12-05T21:00:31.253463Z 0 [Note] InnoDB: Waiting for purge to start
2016-12-05T21:00:31.321828Z 0 [Note] InnoDB: 5.7.16 started; log sequence number 2533313
2016-12-05T21:00:31.321828Z 0 [Note] Plugin 'FEDERATED' is disabled.
2016-12-05T21:00:31.321828Z 0 [Note] InnoDB: Loading buffer pool(s) from C:\Program Files\MySQL\MySQL Server 5.7\data\ib_buffer_pool
2016-12-05T21:00:31.536860Z 0 [Note] InnoDB: Buffer pool(s) load completed at 161205 23:00:31
2016-12-05T21:00:31.552464Z 0 [Warning] Failed to set up SSL because of the following SSL library error: SSL context is not usable without certificate and private key
2016-12-05T21:00:31.552464Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
2016-12-05T21:00:31.552464Z 0 [Note] IPv6 is available.
2016-12-05T21:00:31.552464Z 0 [Note]   - '::' resolves to '::';
2016-12-05T21:00:31.552464Z 0 [Note] Server socket created on IP: '::'.
2016-12-05T21:00:31.688404Z 0 [Note] Event Scheduler: Loaded 0 events
2016-12-05T21:00:31.688404Z 0 [Note] mysqld: ready for connections.
Version: '5.7.16'  socket: ''  port: 3306  MySQL Community Server (GPL)