What is the error message?

>I am attempting to use EditSource function to open a file, but file is not opening. I am getting a strange error code returned; error code 295. Help file does not list this error code. Does anyone know what this is? And can anyone point to a better list of possible error codes.
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>Update: The file is first opened using FileToStr(). Afterwards, the EditSource() fails. Even, another FileToStr() fails.