If you want to convert a FAT32 drive to NTFS file system without losing data, you can use the convert command line or a third-party converter tool.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

When you're reformatting a drive, memory card, or flash drive you need to pick a file format. If you see FAT32, exFAT, and NTFS, but don't know which one to pick, here's what you need to know.