What file system does Windows use?

FAT32 is the file system used in some older versions of Microsoft Windows.

You can also install the FAT32 files system on Windows XP (all versions), and even Windows Server 2003.

However, for all operating systems capable of running it, both UITS and Microsoft strongly recommend using NTFS instead.

What file system should I use for Windows 10?

Use NTFS file system for installing Windows 10 by default NTFS is the file system use by Windows operating systems. For removable flash drives and other forms of USB interface-based storage, we use FAT32. But the removable storage larger than 32 GB we use NTFS you can also use exFAT your choice.