You're here because you have a file that has a file extension ending in .trx. Files with the file extension .trx can only be launched by certain applications. It's possible that .trx files are data files rather than documents or media, which means they're not meant to be viewed at all.

A Visual Studio test results file is created by a software from Microsoft that can be used to create Microsoft Windows applications, and this software is the Visual Studio program, also developed by Microsoft. A Visual Studio test results file is integrated with encoding specifications proprietary to Microsoft for the TRX file format, also proprietary to Microsoft. Affixed with the .trx extension, the content of a Visual Studio test results file contains results associated to particular tests done by a user in the Visual Studio software. This is because the Visual Studio program is implemented with a set of features that can be used to simulate the functionalities coded into a Microsoft Windows application development project to pinpoint certain issues and problems that the Visual Studio software may encounter during the simulation of those application-specific functionalities. This also means these Visual Studio test results files are used for debugging certain problems in a Microsoft Windows application project created with the Visual Studio program, as well as for improving those functionalities. The data stored in these Visual Studio test results files are also used by the Visual Studio application to display in the GUI (Graphical User Interface) of the program the results of certain tests implemented by the user for a Visual Studio application development project.

Launch a .trx file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .trx file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .trx files aren't yet associated with it. In this case, when you try to open a .trx file, you can tell Windows which application is the correct one for that file. From then on, opening a  .trx file will open the correct application. Click here to fix .trx file association errors

Be careful not to rename the extension on .trx files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

A file extension is the set of three or four characters at the end of a filename; in this case, .trx. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.