setReadOnly() vs canWrite()

I'm trying to delete a file but no matter what I try it doesn't seem to work. I set the file to read only using `setReadOnly()` and then immediately check to see if I can write to it and I can. I'm using windows and I have found that there could be bugs with these methods. Is there any way to completely close a file and cut off all access to make sure I can delete it?
Where the file is coming from? Are you generating it in your code? If so please provide the code.

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