Just got mine a few days ago. It’s a legit, full functioning version of Win 10 that is shipped. If you can do it on a laptop, you can do it here. Now just mind you that the 64gb is already portioned into 2 drives, so plan on buying an extra card (supports up to 128gb) and that the extra space will only be visible in windows, not android.
If you format the 128GB card to FAT32 like i did then it would be read in both Android and Windows. The only storage issue i have found in Android is that there isn’t any save to SD storage option, but, if say, you download a movie in windows you would be able to view that movie in Android
Ram, if you do not intend to use Android, you can erase all partitions on the tablet and install Windows 10 only, so you’ll have all internal space available for Windows 10. You can install Windows 10 version 1511 downloaded from Microsoft, the tablet has a valid Windows 10 home license.
You can install any software that works in Windows 10 Home.