I don't even see it listed on the camera sheet. http://helpx.adobe.com/creative-suite/kb/camera-raw-plug-supported-cam eras.html
So may be awhile. DNG for temp. fix?
Camera support in Photoshop CS6, Lightroom, and ACR can be confusing.
See this link for an explanation:
ACR7.1 will have the superset of all currently supported cameras in ACR6.7 and LR4.1 plus a few extras.
User error: The DNGC only converts an entire folder at a time, so you won’t see the individual files listed when you navigate to the folder containing them since the OS-dialog is only showing folders, not files.
Ok, an unknown user error, then. The DNG Convert 6.7 RC does convert Canon 5D Mark III CR2s to DNGs. Perhaps you’re using an older version of the DNGC? Do you get an error? Do you have permissions to the folder?
You assert the DNG Converter does not convert Canon 5D Mark III files. This assertion is false. The question is not whether you know how to use a computer, it is whether you know how to use the DNG Converter. If this is your first time, it is confusing in that it does not show you any files when you browse for the folder to convert files from. This is still the most likely explanation of your situation based on what you’ve said.
Here is a screenshot of a conversion of a 5D Mark III image with the DNG Convert 6.7 RC using a RAW image downloaded from the following website:
Digitline, I don't see anyone accusing you of anything, being rude or insulting in their response to your assertions. I understand that it is not working for you, HOWEVER, it should be so there must be another issue. There are not a lot of choices other than computer error, file error, software error, or user error. Everyone is simply trying to figure which of these it is.