is a document file in XML format. The file contains complete set of information regarding results of tests carried with Microsoft Visual Studio software. Visual Studio is a integrated development environment, which is used by programmers to created new software. TRX files hold test results performed by programmers as part of the software development process.

Users working with Visual Studio must remember that TRX documents are not generated automatically, and the test data are stored in cache memory. In order to access historical test data the file need to be manually exported.