A tmh file extension is related to the Trace message header file format. A thm file stores declarations of functions and variables.
Software that open tmh file
TMH file extension - Trace message header
What is tmh file? How to open tmh files?
File type specification:
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.
The default software associated to open tmh file:
Microsoft Windows Software Development Kit 
Company or developer:
Microsoft Corporation
Windows Software Development Kit is a set of tools, code samples, documentation, compilers, headers, and libraries that allows programmers to create apps for Windows operating system.
List of software applications associated to the .tmh file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open tmh file, edit tmh file, convert tmh file, view tmh file, play tmh file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting tmh files.
Software that open tmh file - Trace message header
Programs supporting the exension tmh on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about Microsoft Windows Software Development Kit for open tmh file action.
