I have a similar situation to the OP ... has there been a resolution?

In my case, trying to recover what I believe were healthy MDF and LDF files from a HDD that was pulled from an old Windows 7 box that has since been upgraded to Windows 10. Unfortunately, the tech that did this did not know it was necessary to detach first (or didn't realize the user even had local SQL databases running for some local apps). Since this was a workstation and not a server, I'm not feeling optimistic that I'll find any recent backups.

I hooked the old HDD to the new Windows 10 box running SQL 2014 and I see all of the MDF and LDF files on the old drive:

- Tried to copy the MDF and LDF files to any HDD (portable USB, new C-drive, etc) - access denied.

- Took ownership of the entire DATA folder and all subfolders/files on the old HDD and tried to copy - access denied.

- Tried to attach to the MDF through the new SQL 2014 instance - access denied.

I've been able to copy other random files from the old HDD to the local drives (C, USB, etc.) without problem so I'm not sure why the old SQL folders are acting different.