XDI is the file extension used by a data archiving utility called WinArchiver. XDI is a compressed disk image file created in a program. Such a file contains the complete contents of the archived disk and can be mounted in the operating system as a virtual disk using the WinArchiver Virtual Drive utility. It is not necessary to decompress it by the user. XDI files can be used as disk backups.

Win Archiver is a program that supports many archive formats. It was developed by Power Software Co., Ltd.