Files only being recognised as PDF file extension says gpx. but my laptop not recognising this and only saving as PDF. Then I can't upload to garmin connect.

Are these courses or activities you're trying to upload? You really don''t have to open them, just import them using the appropriate page of Garmin Connect Web. If they are activities, then you should still be able to drag and drop the files on to the Garmin Connect Import Data page.

If t hey are courses, then go here - https://connect.garmin.com/modern/courses, then click on the import link, then drag and drop your gpx file.

If you get an error message then there is a problem with the file. In that case, please zip the file and attach it to this thread. We can look at it to see what might be wrong.

To remove the incorrect GPX file association in in Windows 10 open Settings >> Navigate to Apps - Defaults Apps >> Go to the bottom of the page and click the Reset button under Reset to the Microsoft recommended defaults.

Hi I have tried the browse as you have suggested. I have also changed the open with and now it opens in notebook 

Don't open it. It is not necessary. You are only importing it. Are these courses you are trying to import into Garmin Connect?

I haven't opened it but the pdf file symbol is associated to it. The gpx file association has disappeared as well.  

It doesn't matter, as long as it has the .gpx extension. Just drag and drop the file onto the Garmin Connect Import Data page.

Or if this is a course, then go here - https://connect.garmin.com/modern/courses, then click on the import link

then drag and drop your gpx file onto the page.

I have been emailed some gpx files but my laptop is only recognising them as PDFs

It could be that the person who emailed you the GPX files, mistakenly sent them as PDF's (for example using the function Print-to-PDF). Ask him/her to send you the original GPX files instead, not PDF's.

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No they are gpx on the email and I can open them on my phone it is when they come into my email - I am using a web browser might this be the issue?

I am using a web browser might this be the issue?

Possible. Download the files from your phone then, if they are all right there. Or import them with the Garmin Conect Mobile app, directy on the phone. See the instructions here: Uploading a Third-Party Course into Garmin Connect