Unzip only ".txt" files in a particular folder

[rathishk3]

Hi,
I got some code which will select multiple zipped folder and extract the files in the selected zip folder.
The given below code will extract all the files however i am trying to get all the (.txt files only) from the all selected zipped folder.
I tried but ended up with a mess. Can anyone help me on the same.
Please....

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