Security in x windows?

Windows 95, 98, and Me are designed to be a single-user system and the security model is therefore not comparable to the one in Windows NT. One reason of that is the FAT and FAT32 which are the only file systems that Windows 9x officially supports, although Windows NT also supports FAT. FAT and FAT32 have very limited security; every user that has access to a FAT drive also has access to all files on that drive. The file systems provide no access control lists like NTFS.