MDI

File Format
Name	MDI
Ontology	Electronic File Formats Graphics MDI
Extension(s)	.mdi
MIME Type(s)	image/vnd.ms-modi

MDI is a proprietary image format used by Microsoft Office Document Imaging.

It is almost identical to TIFF, but has a different header, and may use one of several undocumented compression schemes.

Identification

Files begin with bytes 45 50 2a 00.

Compression

The compression schemes are reportedly known by the following names:

Code	Compression scheme
34718	MODI_BLC
34719	MODI_VECTOR
34720	MODI_PTC

Another source swaps the definitions of 34719 and 34720:

Code	Compression scheme
34718	Binary Level Codec
34719	Progressive Transform Codec
34720	Vector

Links

• Wikipedia:Microsoft Document Imaging Format
• Wikipedia:Microsoft Office Document Imaging
• Media type registration