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Pkzip2 plaintext

I have a zip with 3 files inside pkzip2 encrypted plus 1 folder unencrypted. 
1 of 3 files is a plaintext with 6 lines an 123 characters. I have this file unencrypted
Is it possible attack a pkzip2 with this info?

Thank so much
I you have one of the files completely unencrypted, it is possible to run a Known Plaintext Attack. If successful, it would allow you to decrypt the whole archive without knowing the passwort.

You can use this tool to run the attack:

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