I have tested now with trident and it is not working too. If i import a file which is compiled too the import works, but if i take a other file it doesnt work.
Is there a need to write something in the scripting box like for export / saving files?
Well, if you want to let the user select a file from his computer and read it with PHP, you should avoid the form method, and use the HEScript approach. See this topic: http://www.exeoutput.com/help/choosingfilesupload.htm
Selecting files with PHP scripts in local applications - Upload replacement