CF9/10: Change file attributes

Hello, everyone,

Is there a way to change the attributes of a .txt file that already exists?

For example:  I use CFFILE to write a .txt file that is blank, and supply the "readOnly" attribute.  Later, I want to dynamically add data to the file.  How do I set the .txt file to NOT readOnly so I can add data?  And, conversely, how do I set the attribute back to readOnly?

V/r,

^_^