OTH files exist as 2 different types. Please find information about each of them below.
Type 1: OpenDocument HTML Template
The OTH file extension relates to the OpenDocument HTML Template format. The OASIS group defined this XML-based standard. OTH files store template documents for office use. They work with software on ...
The OTH file extension relates to the OpenDocument HTML Template format. The OASIS group defined this XML-based standard. OTH files store template documents for office use. They work with software on Linux, Mac and Windows. Apache OpenOffice commonly handles these web files.
OTH files also connect to the Microsoft PowerToys Explorer. These extras develop after a Windows release. They can customize graphs in the Origin data tool. Engineers and scientists often use Origin. Its theme files end in OTH too. You can edit Origin themes after saving them.
OTH files have wide support, but low popularity. Programs on desktops and phones can read or write them. But OTH files rarely show up on devices. Still, you can view and edit them for free online. No install needed.
LibreOffice
Apache OpenOffice
Calligra Suite
Origin