The game does not natively support modern resolutions. You can force 1920x1080 by editing the ResolutionIndex in the Windows Registry (typically found under HKEY_CURRENT_USER\Software\Classes\VirtualStore\MACHINE\SOFTWARE\WOW6432Node\Pivotal Games\Conflict Desert Storm\Device Settings ). Setting the decimal value to 73 is a common fix for 1080p.
The original game features 12 missions. Modders have added several more, as well as alternative takes on existing ones. Conflict Desert Storm Mods
The short answer is
While there is no single "complete content" mod for the original Conflict: Desert Storm The game does not natively support modern resolutions
One of the most requested features that never truly materialized was a functional Map Editor. Because the levels were built using proprietary tools, the community was never able to create custom maps from scratch. Conflict Desert Storm Mods