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The ext4 or fourth extended filesystem is a journaling file system for Linux, developed as the successor to ext3. As the windows OS is owned by Microsoft there could be compatibility issues. Originally developed by Cluster File Systems for the Lustre file system between2003 and2006, meant to extend storage limits and add other performance improvements. In2008, the principal developer of the ext3 and ext4 file systems, Theodore Ts'o, stated that although ext4 has improved features, it is not a major advance, it uses old technology, and is a stop-gap.As it was developed after XP it could be the main reason it is not compatible with xp. Also Linux and windows are rivals as provider of OS to computing devices like desktops, laptops , etc.
ext4 does not yet have as much support as ext2 and ext3 on non-Linux operating systems. ext2 and ext3 have stable drivers such as Ext2IFS, which are not yet available for ext4. It is possible to create compatible ext4 filesystems for use in Windows by disabling the extents feature, and sometimes specifying an inode size. Another option for using ext4 in Windows is to use Ext2Fsd,]an open-source driver that, like Ext2IFS, supports writing in ext4 partitions where extents have been disabled. Viewing and copying files from ext4 to Windows, even with extents enabled, is also possible with the Ext2Read software More recently Paragon released its ExtFS for Windows which allows read/write capabilities for ext2/3/4.
