The only attaching points of the windshield frame are the bottom center and one hinge on each side of the top 2 sections, near the center of each window. You can push the edges out because of the springing of the center bar mount. The suggestion to look under the dash, may be the best way to start. The PO may have latched the bottom somehow to keep it closed. Push from the bottom center, of the V, to try to open it, if it is not latched.
