Translation of Dateiendung

I forgot to mention: you can forward this site which explains a little about language learning. I tried to call you on your mobile but it is not working. Please call me on this number: number undisclosed.
In my next message to you I want to write everything in German. Than I will rewrite it in English and we can compare the output. This way you see the text in your mother tongue and in a foreign language.
This province was only one mile away from China and one could see the border control. From there it was a bus ride up the hill, about an hour or so passed and we arrived at our final destination.