File Type 1 Generic IconMultiple Index File
File Format Proprietary (dataBased Intelligence)
Usage Referenced by an application; not meant to be opened manually
Popularity ★ ★ ★ ☆ ☆  Average

Index associated with a database file; typically created along with a .DBF file; can be opened with dBASE IV or Borland InterBase.

Open With


IconBorland InterBase

Updated 2007
File Type 2 Generic IconExtended Media Descriptor File
File Format Proprietary (DT Soft)
Usage Open manually; may be referenced by an application
Popularity ★ ★ ★ ★ ☆  Common

An MDX file may also be a disk image file created with DAEMON Tools. It contains the header information, typically stored in an .MDS file, as well as the actual data, which is often stored in an .MDF file. Therefore, the MDX format combines the MDS and MDF files into a single file.

Info About DT Soft Daemon Tools

DAEMON Tools is a disc emulation utility that allows users to make virtual CDs, DVDs, HD-DVDs, and BluRay discs. These virtual discs, or "disc images," allow users to data create local copies of optical media. Once the disc data has been copied, the physical disks are no longer necessary. The software supports up to 16 virtual drives at one time.

Open With

IconDT Soft DAEMON Tools


Updated November 9, 2010
File Type 3 Generic IconRational XDE Model File
File Format Proprietary (IBM)
Usage Open manually
Popularity ★ ★ ☆ ☆ ☆  Uncommon

Model created with IBM's Rational XDE (eXtended Development Environment); available in multiple versions, including Java and Visual Studio; saved in XML format and can be navigated using the XDEModelWalker included with Rational XDE software.

MDX files are similar to .MDL files created by IBM's Rational Rose.

Open With

IconIBM Rational XDE Developer

Updated 2007
Information from the PC File Extensions Reference