Hi Tashamano
The file in not meant to make sense in notepad - it is a set format with each line having a set number of characters - so lots of empty spaces - this is normal - ensure you do not edit or change the file in any way.
I suggest you create the file again and try to lodge - it might have been an issue with the ATO systems at the time. I had an error lodging yesterday, contacted the ATO and they advised to re-lodge - this time it went through.
There is clearly no problem with the file name, so if the error continues, there might be something else at fault. Ensure you upload from the computer on which you created the file, emailing the file is known to cause issues. If you need to email, zip it first.
Regards
Gavin