How to open the iPhone if i forgot the pass code without losing my data or files?

Sorry, no. These are the only steps you can perform in such a situation:

https://support.apple.com/en-us/HT204306

Regards

Giulio

You will need to restore your phone but you can then reload your most recent backup so you should not lose too much information. Hopefully you are doing an iCloud backup daily or an iTunes backup at least weekly.