For M3&M6 Resource Editor 1.22 I have made a new profile for firmware version M3 T2.003.5 to enable previews. Copy "M3_2.003.5.xml" to the "previewConfig" folder.
To preview a skin load the 2.003.5 resource.bin file, select "Preview" on the menu bar then M3_2.003.5. Then select "Edit" in the menu bar and select the Chinese text at the bottom to open the Preview Window.
You can rotate through available images in each section by pressing the first\left side button at the bottom of the window. If you want to save a preview screen to .png press the second button, bottom right. Images are saved to wherever the resource.bin is located.
You can download M3&M6 Resource Editor 1.22
HERE