Best way to transfer files between iPhone and Windows PC
The software you should be looking for is iTunes, specifically iTunes for Windows. You can download iTunes for Windows via:


direct download from Apple's website using this link.
Microsoft Store using this link.


If you wish to transfer and playback unsupported videos files on your iPhone, install VLC for Mobile on your iPhone and use iTunes File Sharing feature to easily transfer video files to your iPhone.

For detailed instructions regarding file sharing, refer to the Apple Support Article:


Use iTunes to share files between your computer and your iPhone, iPad, or iPod touch.