Windows maintenance tool problem

QTIFW generated installer fails to create maintenance tool under circumstance:

• A user who has Administrator rights has invoked installer.
• The destination folder is C:\Program Files\Program_name

After several investigation, I found:

QTemporaryFile cannot copy,rename files even if it is in "elevated process".

(I successfully fixed this problem by changing the code to delegate copy/rename task to QFile instead of using QTemporaryFile)