Garmin BaseCamp is a great free GPX file viewer ... But, if your GPX file is OK and you want to open GPX files on a Windows 11/10 computer, then you can use some third-party GPS viewer tools ...

To open and view a GPX file on Windows, you can use dedicated free software. There are plenty of free software that let you do so. Some of these software include GPX Editor, Garmin BaseCamp ...