1 files changed, 8 insertions, 1 deletions

diff --git a/js/lib/drawing/world.js b/js/lib/drawing/world.js
index 4b117242..0ee66abe 100755
--- a/js/lib/drawing/world.js
+++ b/js/lib/drawing/world.js
@@ -754,7 +754,14 @@ World.prototype.exportJSON = function()
         // convert the object to a string
         var jStr = JSON.stringify( worldObj );
 
-        // the RDGE export function corrupts the data.
+        // prepend some version information to the string.
+        // this string is also used to differentiate between JSON
+        // and pre-JSON versions of fileIO.
+        // the ending ';' in the version string is necessary
+        jStr = "v1.0;" + jStr;
+
+        // You would think that the RDGE export function
+        // would not change the data.  You would be wrong...
         // rebuild the tree
         var root = this._rootNode;
         root.children = new Array();