how can send .dat file through samba

[godwin]

hello,
        I need to exhibit a welcome message to the user who logs through window password into a linux server.I learnt that we can use " .dat " file to do this.I created welcome.dat file and entered the file path in netlogon in smb.conf as path=/home/netlogon/welcome.dat.I created this .dat file in MS-DOS  later copied it under /home/netlogon.restarted samba .When I loged out window98 machine and login again it throws an error message : " Your share name cannot be found ".My welcome.dat file has a simple dos command  " net time \\server-name /set /yes " .Please suggest the best from your side.
godwin
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