I have ArcGIS 10.2 and 10.2.1 both with Data Interoperablilty extension. But there is a problem with GPX files. ArcGIS simply doesn't see it. In 10.1 there was no problem to drag n drop them but now it's impossible. In quick import tool, when I open FME reader gallery I can't find gpx on the list. What's going on? Have you the same problem?
Have you tried the GPX to Feature tool in the Arc Toolbox? It is located in the Conversion Tools > From GPS > GPX To Features.
If I attempt to drag and drop a .gpx file, a message that says 'Could not open the specified file' appears.
Try this then: In ArcCatalog, click on Customize > ArcCatalog Options > Click on the File Types Tab and manually add in the .GPX file extension. The file will then be recognized.