Filtering added files

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I need to burn many Blu-rays discs with photos for backup. My files are all .JPG or .DNG files nested in numerous folders. I only need to burn the .JPG files and not the .DNG files. When I add the files (or after I have added the files) to Imgburn is there anyway to create a filter so that I delete all the .DNG files from the files to be burned to the Blu-Ray?

I realise I could copy all the folders I want to burn to a new folder and then use windows explorer to delete all the .DNG files but I was hoping there was a quicker way with imgburn.

thanks