[Samba] Excell file problem with samba 2.0.7

[Aviad Sarfatty]

Hello,
I am running Samba 2.0.7 on linux Redhat 7 kernel 2.2.22 as shown below.
[root at serv aviad]# uname -a
Linux serv.mobilitec.com 2.2.22-7.0.3smp #1 SMP Thu Nov 14 11:51:44 EST 2002
i686 unknown
[root at serv aviad]# /usr/sbin/smbd -V
Version 2.0.7

I encounter a problem with excwll files on sharing point which somtimes
opens as a read only files, but I'm sure that only one person is using them
at the same time.
I found an article which explains to add to the smb.conf the two lines:
force security mode = 0200
dos filemode = yes
which didn't solve my problem.
when restarting the samba server I found in the /var/log/samba/log.smb:
(samba log file)
[2004/08/25 16:48:14, 0] param/loadparm.c:map_parameter(1681)
  Unknown parameter encountered: "dos filemode"
[2004/08/25 16:48:14, 0] param/loadparm.c:lp_do_parameter(2223)
  Ignoring unknown parameter "dos filemode"
So I guess this command is working on later versions, and I'm trying to find
the
command which will work with this samba version.
or to find any other suggestions to solve this problem
below is the global part from the smb.conf and the relevant share point:
[global]
        workgroup = MOBILITEC
        server string = Samba Server
        interfaces = eth0 eth0:0
        encrypt passwords = Yes
        log file = /var/log/samba/log.%m
        max log size = 100
        socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
        domain master = No
        dns proxy = No
[morel work]
        path = /home/morel/work
        force directory mode = 0770
        writeable = yes
        create mode = 0770
        force create mode = 0770
        directory mode = 0770
        force group = Finance
        valid users = @Finance
        comment = morel work
        write list = @Finance
        force security mode = 0200
        dos filemode = yes

I would appriciate any help,

Thanks in advance

Aviad.