it's optional. So just skip it if you're not sure.... @KukaiWallet

Answer: To open a .tez file, you will need to use a program that is compatible with the file type. Depending on the type of file, you may need a specific program, such as a text editor, image editor, or audio/video player. If you are unsure which program to use, you can try searching the internet for a program that can open the file type. Additionally, you can try right-clicking on the file and selecting "Open with" to see a list of programs that may be compatible.

I need to open .tez file?