How to transfer Mac Photo Library Photos to actual images?

Put simply - you are going to need two external hard drives. One formatted suitably for photos (APFS or Mac OS extended), and one formatted suitably for reading both on a mac and a windows machine. If you continue to use photos on the Exfat machine you are risking losing access to all your pictures.

So if you want to to this, you need to do the following.

• Buy a second external drive. Format it MacOS extended journaled BEFORE using it.
• Move your photos library to this drive, leaving the old on EXFat for transferring data to windows.
• Export all your pictures from photos to the EXFat drive and then to windows.

Finally if you don't already have a backup process in place, get one.

A Photos library can't be accessed by a PC so the images must be exported out of the library to a hard drive that a PC can access, i.e. MS-DOS (FAT). So if you export as I showed in my previous reply you'll get folders of image files that a PC can access with whatever app it uses to view image files. Exporting leaves the Photos library intact so you won't lose anything.

Here's how you can produce all jpeg files for use on the PC.

You should export them to the external HD what is formatted

so that both the Mac and PC can access the image files that have been exported.

Put what?

See there where I explained about exporting?

1. Get the Photos Library of the EX Fat drive. It needs to be on a drive formatted Mac OS Extended (Journaled) or AFPS. You're risking library corruption and dataloss having the library on an inappropriately formatted drive.
2. There is no version of Photos accessible from Windows so you'll need to export the Photographs: File -> Export -> Unmodified Original for the originals, or sue the File -> Export command to export edited versions. IN that dialogue you can choose from a number of formats, of which jpeg is probably the most compatible

First, running a Photos library on an ExFAT drive is not supported and a recipe for disaster: Where is it safe to store a Photos Library - 2019 Version

Copy it to a correctly formatted volume - Mac OS Extended (Journaled) preferably with ownership set to be ignored.

Now try to open it there. Hopefully you will be able to. Now you can export the unmodified originals with the following settings:

This will put the image files in folders named for the location and date taken to help with out of library organization.

If you want to change the formatting on a drive that contains data you care about, you have to move the data you care about to another drive first, then change the formatting, then copy the data back.

However, there is no format that can allow a Windows PC to read the contents of a Photos library. You have to export the pictures to simple files, then read the simple files with the Windows PC.