File created by Alpha Five, an IDE that enables users to develop Web, desktop, and mobile applications; contains table objects such as report designs, saved operations, and layouts all in memo format, like the .FPT file; linked with a .DDD file as it contains the code for the field rules, designs, etc. that are stored in the DDD file.

The DDM file keeps track of every time you make an edit to an operation or layout for a table. So the more edits you make, the larger the DDM file will be. For every table you create in Alpha Five, a DDM, DDD, and .DDX file will be created. These files make up the table data dictionary for a .DBF file. The dictionary stores queries, saved utility settings, and layouts. It's referenced by Alpha Five to overcome limitations of the DBF file. DDM files should be kept with the DDD and DDX Data Dictionary files in order for Alpha to find all of the elements and their pieces. NOTE: In 2013, Alpha Five became Alpha Anywhere.