How to read write file in HTML5 extension

Hi,
I think it could be very generic question since moving from Flex to HTML5 extension is loosing ability to read write a file in local file system.
I'm trying to write a log file within extension space but It throws error as 'TypeError: Illegal constructor'
new File(csInterface.getSystemPath(SystemPath.EXTENSION)+"/log/Log_"+.getCurrentDateString+".txt");
does someone have solve for this.
Thanks in advance
MM

Yeah, It could be a reason for nested error but I got the error right before executing "getCurrentDateString". But I kind of figured it out as Javascript looses ability to read write file in user file system except Crome browser, you can read more here. However Adobe has added fs API within CEP which allows user to read and write file in user system.
Here is some peace of code on how to do it, complete API reference check here :
var result = window.cep.fs.writeFile(logFilepath, "Your data goes here");
  if(result.err != 0)
  throw new Error("Result object has error");
However still this does not provide any method to append the content in existing file as a result if you wanted to write kind of log file, every time you need to first read the file and then concatenate your content to file data then write data again to new file. sound hefty to append content?
I'm hoping if any Adobe staff has any comment on this.
Thanks
MM

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