What is a TM file?
A .TM file has multiple possible meanings depending on the software that created it. The most common use is a Teachable Machine Project file created by Google Teachable Machine. These files store machine learning models and training data. Another frequent format is a Twinmotion project file created by Epic Games Twinmotion, which stores 3D architectural scenes. Other software like GNU TeXmacs and the Thunder download manager also use this extension.
How to open TM files?
Because a .TM file can be many different things, you must know the exact format before choosing a program. If it is a Teachable Machine Project, you can open it in Google Teachable Machine. If it is a 3D scene, you need Twinmotion. If you try to open a .TM file in the wrong program, it will show an error.
Software and tools
Various programs use the .TM extension. Google uses it for browser-based machine learning. Epic Games uses it for 3D visualization. ACCA Software uses it for building energy analysis.
Best practices and troubleshooting
Do not rename the extension of a .TM file. This will not change the file format. If you do not know which program created your file, you can inspect its internal structure. Many .TM files from Google are formatted as ZIP archives, while Twinmotion files use an SQL database structure. You can use standard archive extractors to look inside the ZIP versions.
Summary
viewer.online/tm analyzes .TM files to identify their exact format and creator software, shows which programs can open the file, and usually previews it. If you are uncertain about the origin of your file, viewer.online/tm identifies the actual format of your document. Because .TM files from the Teachable Machine Project use the known ZIP format, viewer.online/tm can safely open and display them online, eliminating compatibility problems.