[Wine] Network initialization failed

[aeios]

Hi,

I successfully installed wine 1.2.3 on Debian squeeze amd64.
Preliminary tests are fine.
I use a ~/.wine/dosdevices/unc/myserver/myfolder linked to a smbmout in /home/myfolder to emulate a windows network share. 
I can launch "wine notepad '\\myserver\myfolder\test.txt' ", edit it and save the changes; so the permission seems right.

I want to use an old app who needs to access his data from \\myserver\myfolder\somefolder\*. This app was written in Delphi and uses a Firebird Database. On launch, the apps says:
"""
Network initialization failed.
Permission denied.
File: Z:\HOME\MYFOLDER\SOMEFOLDER\SOMEFILE.EXT
Unknown internal operating system error.
Directory: Z:\HOME\MYFOLDER\SOMEFOLDER\.
"""
As nothing appears in the console, I have no clue how to debug this situation.
Any help or advice is welcome.

Thanks for your attention.
Regards,
Jean-Charles