there is no problem accessing the SD Card on Windows 10. Windows 7 simply is not capable of dealing with cards with multiple partitions, this is a known problem and something that Microsoft decided to do.
If you have problems on Windows 10 then either your card is corrupt or you don’t have the latest Windows 10 updates, or you have an Administrator who locked down accessing cards on your computer.
Keep in mind that it is normal for Windows 10 to want to format your card. Do NOT let it do that as you might lose your presets or samples on the card and then have to re-write the image to the card. Again, this is something that windows always does and I have no control over this. Just ignore the popups.
Also, the only partition you should really access is the BOOT partition. Do not mess with the other drive letters or partitions on the card.
On Mac OSX, or linux, we don’t have any of these issues …