This file type was created to allow me to manage my music collection in such a way that: a) the actual files didn't need tagging , b) identical filenames would show up as "dupes" , and c) quick load/save outside of an Access/SQL database.  JMD files reside in a central folder with each one matching a given audio file (whether ending .mp3 , .flac or .wav).  This makes it possible to easily spot existing/missing audio items as well as using the "WAV" checkbox in the SongCard to determine whether you already have a track in linear WAV (CD) format.

Even if you use MyLibrary to import into a playout system, you can still use the JMD files to keep your song data - even more so if you also hold a copy of the songs in Artist - Title format.  By giving your tracks a Cart Number in MyLibrary, you can easily restore missing carts or re-import specific songs (by Style, Year etc) later on. This means that if you were to import a compilation CD, duplicate songs would automatically appear as "tagged" because matching JMD files are present for that filename.

Remember, with the Database disabled, changes made in the main list-view (using the Mass Changer ) are NOT permanent until you export to a tag/file format - this can be your friend, or a nuisance - so please ensure you understand what changes you are making and how you intend to save them.  Sometimes, you might not - You could temporarily re-number your Cart Numbers for a different radio station, exporting to a CSV/Tab Text File using these temporary values whilst keeping your own numbering system intact.

Viewing a Track's JMD Data File
You can load a track's JMD file by clicking the text label "Saving JMD Data File" next to the Save button - this will load the JMD contents into Notepad.  There is also a right-click option in the main list view "Show Tags for this File" which shows a variety of tags/data.

JockMaster JMD Format Specification
The JMD format is based upon the popular INI settings format and contains a variety of fields used in broadcasting - some fields are compulsory, others aren't.  All of the fields used in MyLibrary are saved to this tag format - it is the one to use if you want a quick and easy way of storing/managing your song data.

You can, of course, use a third-party application to manipulate these files if you wish.

Here's an example of a JMD file tagged in MyLibrary: