How to transfer files to new computer using My Passport external hard-drive?

WD External Drives WD Portable Drives
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I have backed up all my files from my Windows 7 laptop, which has now died.

Iwill be replacing it with a Macbook pro - but I’ll then have to re-format MyPassport, prior to using it, which will erase all the files - so how do I get my files on my PC formatted MyPassport to my new Mac?