The EVTX file type is the new version of EVT, primarily associated with 'eventvwr.msc' by Microsoft Corporation and is based on XML.
EVTX files are Microsoft Event Viewer logs that can be viewed using Event Viewer. To launch Event Viewer hold Windows Button whilst pressing R and then type eventvwr.msc in Run window.
You might not be able to view all event messages in an EVTX file that was created on another computer. Events are recorded through .DLLs which are required to read a particular message. If a particular .DLL is not available on your PC you will get an error message for that event.