.THM

.THM

Clip art Theme title and resources index file (IBM Lotus Symphony).
Skinning Theme files (DreamQuest Championship Euchre, Hearts, & Spades).
Theme file (Many applications).
Thumbnail image file, often sharing the same file name of a resource file whose content it illustrates (Varying types, usually JPEG, TIFF, PNG, or some form of bitmap, many applications).