Extension: thm
What is it? OpenOffice.org 1.1.x Configuration File
Where’s it from? Thm files are created and used by the free Open Office v1.1x office productivity suite. Open Office is a free, open source alternative to the pricey Microsoft Office suite. Thm files contain information about user preferences, such as word processor page layouts.
How do I use it? Set your preferences in Open Office and it will take care of the thm files.
Can I safely delete or move it? Yes, but you will lose your Open Office preferences.
Can it be dangerous? No malware has been reported to exploit thm files.
–David Hakala