What are *.thm files?

[drunkenmaster]

Every time I copy my folders from my Canon Eos 300d to my PC, may raw files are coupled with the same file name but with a thm extension.

Are these necessary to develop the actual crw photo files or can they be deleted?

many thanks

[Liquid101]

Thumbnail?

[limblee]

Small, icon-sized image used to represent a larger image; commonly used on the Web or in clip art galleries; may be created by various photo or video editing programs; also produced by some digital cameras as small sample images of photos saved on the camera.

Source: http://www.fileinfo.net/extension/thm