In order to get the InfoExpress server to create files with the correct permissions, you will need to execute the InfoExpress server from a shell script that sets the correct umask. This should allow you to control the shell that the InfoExpress server is created in. This will give you control over the permissions of files created using InfoExpress.

UNIX-like operating system, have the function, "umask", which can be used to change the default permissions for newly created files for any user.

For more information regarding umask, please consult the man pages for your operating system.