Hi there! Great question! The past participle of "open" is "opened."
Just like with other verbs, the past participle of "open" is used when we want to talk about an action that was completed in the past. For example, you might say "I opened the door yesterday," or "The store had already opened when we got there."
The past participle form of a verb is also used alongside the helping verb "have" to form the present perfect tense. For example, you might say "I have opened the door" to talk about an action that happened in the past but has relevance to the present moment.
I hope that helps! Let me know if you have any other language-related questions.
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