samba - Dec 2002 - Problems accessing files from application

I am experiencing a strange problem.

We have a WIN2K app. from which we want to be able to use files on our
SAMBA server.
 When we try to open a file from the SAMBA share we get a message
"cannot open file G:\file.txt" .
The strange with this is that I am able to open the file from notepad
or Word or any other application.

Any ideas anyone??????

My smb.conf looks like this:

# Global parameters
[global]
        workgroup = DOMAIN
        netbios name = GYLVE
        netbios aliases = gylve
        server string = Samba Server %v
        security = DOMAIN
        encrypt passwords = Yes
        password server = svgw2k01
        passwd program = /usr/bin/yppasswd %u
        passwd chat = *New*password* %n\n *Retype*new*psasword %n\n
*passwd:*all
*authentication*tokens*updated*successfully* 
        log file = /usr/samba/var/log.%m
        max log size = 50
        dns proxy = No
        wins server = svgw2k01
        comment = Samba server %v
        os level = 33
        log level = 1
        socket options = TCP_NODELAY
        deadtime = 15
        mangle case = Yes
        hide dot files = No
        case sensitive = Yes
        preferred master = No
        domain master = No
        local master = No
        short preserve case = Yes
#       nt pipe support = No
#       nt smb support = No
#       nt status support = No
[homes]
        comment = Home Directories
        read only = No
        browseable = No

[tmp]
        comment = Temporary file space
        path = /usr/tmp
        read only = No


Rgds. Jan Fredrik