TMH

Trace message header
File type: Source code and script file
A tmh file extension is related to the Trace message header file format. A thm file stores declarations of functions and variables.
What is tmh file?
File type category:
Source code and script file
Date updated: December 11, 2017
The trace message header (TMH) file is a text file that contains declarations of functions and variables used by the tracing code that WPP generates. The header file also includes macros that add trace message formatting instructions to a PDB file of a trace provider, such as a kernel-mode driver or user-mode application.
WPP generates the tmh file automatically when you compile a trace provider that includes WPP macros. The thm file has the same name as the source file, but with a .tmh file name extension. WPP saves the file in the same directory as the source file.
How to open tmh file?
Use Microsoft Windows Software Development Kit to open *.tmh header files.
How to convert tmh file?
Although you can technically "convert" message headers much like any other text file, there is practically no reason to do it, as such conversions would be pointless.
Suggested software to open tmh file:
Associated software actions with the tmh file
Software applications that can open tmh files:
Microsoft Windows Software Development Kit (Microsoft Windows)
Software applications that can edit tmh files:
Microsoft Windows Software Development Kit (Microsoft Windows)
Software capable of saving tmh files:
Microsoft Windows Software Development Kit (Microsoft Windows)
Software apps that create tmh files:
Microsoft Windows Software Development Kit (Microsoft Windows)