I have some video files recorded in AVCHD and cannot find a way to burn the to a DVD. All DVD making programs say that this is an unsupported file type. Help!!

Maybe the freeware DVDFlick would be worth a try:

(FWIW) It's always a good idea to create a System
Restore Point before installing software or updates)

DVD Flick
http://www.videohelp.com/tools/DVD_Flick
(the file you need to download is : 'dvdflick_setup_1.3.0.7.exe')
(Download from (direct link) is the fastest.)

Save the file to your desktop or a folder on your
hard drive and install from there.

Be sure to read the Guide:
http://www.dvdflick.net/guide.php

Tutorials:

DVD Flick Tutorial
http://beginwithsoftware.com/videoguides/dvd-flick-guide.html

Burn Any PC Video Format into DVD
http://www.freevideoworkshop.com/dvdflicktutorial.htm

To create a basic Video DVD that should play in most
free standing DVD players...try the following...

First...read the DVD Flick Guide to familiarize yourself
with the program.

Open DVD Flick and insert a blank DVD in your burner.

If your computer's Autoplay window opens....just close it.

Click the Project Settings button and go to...Video /
Target format...residents of USA...choose...NTSC /
Accept.

Left click the Add title button and browse to your
Movie Clips and select the ones you want on the DVD.

(when you left click the Add button and Browse for
the files...if your MTS files are not visible for selection
open the drop window and choose All Files)

You can arrange them by selecting one and then use
the Move Up and Move Down buttons.

Left click the Create DVD button / OK / Yes / Yes.

Wait while the DVD is created.

When the text "Finished Successfully" appears you
may close DVD Flick. Now you can eject your DVD
and play it in your DVD player.

At some point you may wish to purchase more
advanced software like Sony, Cyberlink, Nero, Roxio,
Ulead, etc...but at least this is a start.

Good luck.