Okay, there are a few ways to do this using older versions of ForTheRecord's player software. Probably the most direct is (if you the ability to run Windows or to access a machine running Windows), download and install the older version 5.4.2 (the file is named Player542setup.exe) at http://community.fortherecord.com/index.php?/files/file/725-therecord-player-542 -old-version-player542setupexe
Once you install this player, you should be able to play your trm file. When you click on the "Save a Copy to" button (just to the left of the rewind button on the player, it will bring up a small window with options that include "Save format" and you can select "Windows Media" which will save the file to .wma format. This might be enough for you. I however, prefer working with mp3 files and then take the wma file and convet it using All2MP3.
I wish you luck. This company is not only Mac hostile, but they appear to be desperately clinging to an older business model that rewards tricks and gimmicks and fake excuses to keep their "propriatry" and inferrior software limitations - so that they can hold clients hostage. Anyway....
I too have not come across this in some time. I run a small business administering law firms and a staff of paralegals and we all generally use Macs and have virtually no problem with any service these days. Whether it is our large prominent client or our small sole practitioner - Macs have been our choice - and this headache with trm files is a rareity. Thankfull, the software the Court's normally use allows a straight to mp3 conversion, unlike this second intermediate step we have to take with your files.
Good luck.