Open embedded PDF from AIR

What's the recommended solution, to open an embedded pdf document with Acrobat (or any other reader). I've followed a similiar question openWithDefaultApplication fails on files in application folder, but this seems not to work.

var filename = "John_Doe-tax_return_2011.pdf"; // = my filename

var realFile:File = File.applicationDirectory.resolvePath(filename); 
var tempFile:File = File.createTempFile(); 

    realFile.copyTo(tempFile,true); 
    tempFile.openWithDefaultApplication();

I've tested it all, so it's not a directory issue

trace(tempFile.extension) // > tmp (?? tempFile.extension = "pdf" does开发者_如何学Cn't works)
trace(realFile.exists)    // > true (original pdf-document exists!)

solution:

This snippet works for Windows & Apple OSX:

var _myfilename = "John_Doe-tax_return_2011.pdf"; // = my filename

//run:

 //grab the original file by name (_myfilename) from your appDir:
 var realFile:File = File.applicationDirectory.resolvePath(_myfilename);#

 //get user's home directory:
 var destination:File = File.documentsDirectory;

 //copy the original file temponary to user's home directory:
 destination = destination.resolvePath(_myfilename);
 realFile.copyTo(destination,true);

 //open the temponary copy from user's home directory (acrobat or whatever):
 destination.openWithDefaultApplication();

//end;

Don't forget to delete the file again from user's home directory (regarding to your comapnie's policy).