Export RAW format from iPhone to PC

Are you referring to ProRaw? About Apple ProRAW - Apple Support (IN)

Apple ProRAW combines the information of a standard RAW format along with iPhone image processing, which gives you more flexibility when ...

"Share ProRAW photos

Here are the best ways to share your ProRAW photos:

• Use iCloud Photos to access the original ProRAW file in full resolution on all of your devices.
• To transfer the original ProRAW file from your iPhone to another iPhone, iPad, or your Mac, use AirDrop. If you edited the photo in the Photos app and then you share it, you'll share a JPG file. To share the original ProRAW file from the Photos app on your iPhone, tap Share, tap Duplicate, tap Edit, tap Revert, then share the photo using AirDrop.
• To share an edited ProRAW photo with someone else, edit the photo in the Photos app on your iPhone, then AirDrop, email, or send with Messages. A JPG file that includes your edits is shared.
• To email a ProRAW photo, create an email in the Mail app on your iPhone, then add the photo to the email. The Mail app automatically converts the ProRAW file to a smaller JPG file, which you can then send with email.
• If you edit a ProRAW photo and want to share both the original ProRAW file and the edited JPG file, use Image Capture on Mac or the Windows Photos app on a PC to import the files. You can also use AirDrop to share both files to a Mac. Tap on Options and turn on All Photos Data before you share, then select Save to Downloads when you receive the files on your Mac.
• If you’ve edited a ProRAW photo in the Photos app on your Mac, and you want to use your Mac to share the original ProRAW file only, select the photo in the Photos app, then choose File > Export > Export Unmodified Original."