To convert this, you will go through these steps.
Here is your original.
F9 C8 29 9D F2T DDA A8b D7C 9Ac 27 CC
From here, you need to seperate put these in groups of 2. The F9, C8, 9D are alread grouped properly. You see you have F2T as a group of 3. What you do is put a space after F2 and leave T by itself (for now). Once you do that, you will have the following string. Just an FYI. You might run across one with 4 characters in a group. You will leave the first 2 together and seperate the last 2 into singles. So the grouping F2TA will look like F2 T A.
F9 C8 29 9D F2 T DD A A8 b D7 C 9A c 27 CC
Now, you will need to find an ascii to hex converter. I used the one located here.
http://www.dolcevie.com/js/converter.html If you have your own, feel free to use it. What you do here is take the single characters and transform them from ascii to hex. For instance, the "T" becomes "54" and the "A" becomes "41". Please note that a Capital "C" is represented differently than lower case "c". For this example, below is the final string. You can copy this and paste into the proper attribute in ADSIEDIT.
F9 C8 29 9D F2 54 DD 41 A8 62 D7 43 9A 63 27 CC
Make sure you copy this in with no trailing or preceeding spaces.