|Have you got your left & right mouse buttons swapped over? the 'open with' option should normally appear with the right mouse button. Try using the other mouse button & see if the items open as normal, if so then use the 'mouse' icon in Control Panel to correct the issue.|
If the above is not relevant then it may be a malware issue - scan with Malwarebytes.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd