Thm is extension of Thumbnail software. It can be opened by Acdsee or irfan view.
It is abbreviation of thumbnail word. It means nail. This name is given for definining little sized images (like 100 pixel) that is created for various reasons.
Those files can be opened by any current image view software.
You can download Acdsee and Irfan view free from internet.
What to use thm
Acdsee, irfan view
which page related to thm file
thm Related Searches
You can check related links about thm fileextension.