When you downloaded the drivers (or any file from the web), the zone identifier (the source URL and the internet zone it was from) was saved as NTFS Alternate Data Streams (ADS). Since FAT32 doesn't support ADS, the metadata will be dropped when copying the file(s) from an NTFS partition to the FAT32 partition. When you see the following notification, simply click Yes. The file won't be modified. Only its ADS (which is not essential) is lost.

To avoid that notification, right-click on the file you want to copy, and click Properties. Select "Unblock" and click OK.
You can read about the ZoneID MotW at Eric Lawrence's site.
Downloads and the Mark-of-the-Web – text/plain: https://textslashplain.com/2016/04/04/downloads-and-the-mark-of-the-web/
How to Bulk Unblock Files Downloaded from Internet: https://www.winhelponline.com/blog/bulk-unblock-files-downloaded-internet/