Is this the same/similar issue that you posted in https://community.smartbear.com/t5/TestComplete-Questions/unable-to-delete-file-using-testcomplete/td-p/248809 ?
UAC aims to improve the security of Microsoft Windows by limiting application software to standard user privileges until an administrator authorises an increase or elevation. In this way, only applications trusted by the user may receive administrative privileges and malware are kept from compromising the operating system. In other words, a user account may have administrator privileges assigned to it, but applications that the user runs do not inherit those privileges unless they are approved beforehand or the user explicitly authorises it.
Either disable UAC, or store the file in a different location which you have permissions.
