Cannot read file after WP change

Hey, i have encountered a weird problem, i have switched from a WP8548 to a WP7607 i want to run the same code as before. In the app i am reading and writing a file outside of the apps sandbox. With the wp8548 it works fine but with wp7607 i cannot read the same file anymore, the i have listed the file in the required section in the .adef file.

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