mysqldump giving errors

[<cr.vegelin]

Hi All,

I am running mysqldump with --no-data option, but it gives error:
"can't exec 'show fields from ...' out of resources when opening file ... (errorcode 24)
(23)"
perror 24 says: too many open files
perror 23 says: too many open files in system
mySQL show variables says: open_files_limit: 622
and the error occurs at the 74th table.
I have enough GB free space.
Is this error caused by my Windows or by MySQL ?
Any suggestions how to solve this ?

TIA, Cor