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assign4.md

@@ -125,11 +125,14 @@ Pick up to another three for 10 pts bonus for each you accomplish (up to a max o
 your choice. You'd have to come by to pick up the donut.  The points
 will be appliable on either the `assign5` or the final (which will be
 out of 200 pts):
-- (10 pts) *Get your app to read and write files with the .gpx extension*.  Instead of
+- (5 pts) *Get your app to read and write files with the .gpx extension*.  Instead of
   reading and writing .gpx436, read and write .gpx. Here, I'm just
   asking you to get the UTI setup correct so that the document and
   browser will allow you to read and write files with the `.gpx`
-  extension. Doesn't matter what you write.
+  extension. Doesn't matter what you write.  Note that this is more difficult
+  than it sounds. I was not able to do this directly and had to use a
+  workaround (which I shall not reveal). When you are using non-Apple, not-yours UTIs there is a slightly
+  different procedure and the straightforward approach (what you get when you google) just doesn't work.
 - (5 pts) *Get your app to read and write real gpx files*. Your app should be
   able to write read and write RideWithGPX files. Don't worry, look at
   [this file](https://gitlab.cs.umd.edu/keleher/iosstudents/-/blob/master/assign4bmwRS1200GS.gpx) and you will see the format is dirt simple (though