made importing files into variable watchers more lenient wrt to file types

HISTORY.md

@@ -4,6 +4,7 @@
 ### 2018-11-27
 * Objects: Cache stage>>penTrailsMorph to optimize collision detection
 * Objects: Fixed a collision detection errror when objects are sub-pixel sized
+* Objects: made importing files into variable watchers more lenient wrt to file types
 
 ## v4.2.2.8
 ### 2018-11-21

src/objects.js

@@ -9635,10 +9635,10 @@ WatcherMorph.prototype.userMenu = function () {
                                 );
                             };
 
-                            if (aFile.type.indexOf("text") === 0) {
-                                frd.readAsText(aFile);
-                            } else {
+                            if (aFile.type.indexOf("text") === -1) {
                                 txtOnlyMsg(aFile.type);
+                            } else {
+                                frd.readAsText(aFile);
                             }
                         }