Q: copy imovie library to windows

Hi,

I am doing a project for work on my personal MacBook - and our office runs on Windows...

I am trying to copy all the raw media from my iMovie Library onto an external USB so that I can then plug said USB into work's windows computer and copy onto the computer so that it is available to other employees and I can then delete off of my personal MacBook.

If anyone knows how I can simply copy all the footage that I imported directly into iMovie from my iPhone in a format that a Windows computer can read + write that would be greatly appreciated.

*Please note I am not particularly tech savvy, so please if you could give me step by step instructions in basic terminology*

Much Appreciated