Can"t specify "--defaults-file" on Windows

I'm trying to explicitly specify the location of the my.ini file on Windows XP

I'm using:
u:\mysql5.1\bin\mysqld --install --defaults-file="u:\\mysql5.1\\my.ini"

and it complains "Failed to install the service (Couldn't create service)"

I've tried "/" and "\" and "\\" but nothing seems to fix it. I can remove
the --install-defaults-file option and MySQL loads as a service just fine.
It just won't take this option. The My.Ini file is indeed in this directory.

Can anyone shed some light onto what I'm doing wrong?

TIA
Mike


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