Opensuse 13.1 samba 4. running windows programs

This is one of my folder setting for samba 4
force user = smart
read list = @users
force user = smart
inherit acls = Yes
path = /mnt/backup1/Downloads
public = yes

When running a windows program on the read only folder. When running a windows setup program, the software expects to write to the folder. How can I keep the folder read-only and be able to run a program from the folder.

You can run a Windows program from a read only folder.
So this is not your problem.

The problem seems to be that the program you run wants to write to the directory from where it was started.
How to overcome this difficulty is specific to the program you run, not to SAMBA.