Bob, the easiest way I've found is to use the Import / Export feature of XChange2. If you want to export a file to someone, log into XChange2, plug your CTX 3030 into your PC, turn on the detector and when it goes through a short sync process, you should be able to click the red CTX 3030 icon and see the programs that are in your detector. Drag the program you want to share over to the File Folder. You will now have a file in that folder, indicated by the number beside the word File, in the gray area to the right of Collections. To the right of that, you'll find the icons for Import and Export. If you chose Export, you will see the name of the file (XChange2share(1).mlr) at the bottom of your PC screen. One of those options is to Show in Folder. When you do that, the folder in which your file is stored will appear, and you can right click to send it as an email.
If you receive a file from someone, you can Import that file to XChange2 by using Import, and doing thsese steps backward. HH Randy