What is the proper version of 'ope?

"Ope" is a Word on its own and is quite proper. It is the original version of the verb "open" and means the same thing. Originally the suffix -en was an adjective marker as well as a participle marker. The verb was "ope" as in Shakespeare's phrase "has oped its ponderous and marble jaws", and the adjective was "open" as "The door is open". Over time the adjective came to be confused with the participle and then used as the verb stem instead of the verb it was originally based on.