The drive is likely formatted in or HFS+ , which Windows cannot natively read. This is where MacDrive saves the day:

Here’s where it got truly magical: I had an APFS drive that was encrypted with FileVault. Windows saw it as a raw partition. I double-clicked the drive in File Explorer, and a MacDrive password box appeared. I typed my FileVault password. The drive unlocked and mounted instantly. I could read and write encrypted APFS volumes without ever touching a Mac.

To use effectively, you don't need to learn a new interface; it works by making your Windows computer "Mac aware" so you can treat Mac-formatted disks like any other drive. A Helpful Story: The Panic of the "Unreadable" Drive

That’s when I discovered MacDrive. Here is the story of how I used it to bridge the unbridgeable.

A week later, disaster struck. I was on a deadline. My MacBook Pro’s screen died (logic board failure). On that Mac’s internal SSD was the final draft of a client video. I pulled the SSD out, put it in a USB enclosure, and plugged it into my PC.