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.

The compression schemes are reportedly defined as follows:

Code	Compression scheme
34718	Binary Level Codec (BLC)
34719	Progressive Transform Codec (PTC)
34720	Vector

Other sources give the following, but 34719 and 34720 may have been accidentally swapped.

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