What is .OBT file extension?
Theme file used by Openbox, an open source window manager for GNOME and KDE Linux desktop environments; saves settings for window borders, menus, scrollbars, and other visual elements; includes the sizes, colors, fonts, and text styles; used for customizing the window appearance.
Openbox global themes are stored in the /usr/share/theme/ directory. Local user themes are stored either in [user]/.local/share/themes/ or [user]/.themes/.
You can see a list of software programs here on easyfileopener.org that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.