RE: error 'Cannot open the specified file' in Excel using Hyperlink. I followed your advice and indeed by replacing the square brackets with a dash the error is gone. But nevertheless I don't want to change the file name (as file is stored somewehere else also).
ABDOMINAL AORTIC ANEURYSM OVERVIEW. An aortic aneurysm occurs when the walls of the main blood vessel that carries blood away from the heart (the aorta) bulge or dilate. An abdominal aortic aneurysm (AAA) is located in the abdominal area, near the navel (figure 1).Aneurysms can also occur in other areas of the aorta, but the abdomen is the most common site. Abdominal aortic aneurysms are not related to aneurysms of the blood vessels in the brain.BDOMINAL AORTIC ANEURYSM OVERVIEW. An aortic aneurysm occurs when the walls of the main blood vessel that carries blood away from the heart (the aorta) bulge or dilate. An abdominal aortic aneurysm (AAA) is located in the abdominal area, near the navel (figure 1).
1 In the tiny arteries that supply blood to the brain (the cerebral arteries).  In parts of the large vessel that carries blood from the heart to other parts of the body (the aorta). Aortic aneurysms can occur in the area below the stomach (abdominal aneurysms) or in the chest (thoracic aneurysms). An abdominal aortic aneurysm (AAA) is usually located below the kidneys.