Windows 7 cannot unlink extracted zip file

After a rebuild, there is a warning appears:

Warning: unlink(sites\default\files\private\edge_suite\comp_src\edge.zip): Permission denied in unlink()...

Proposed resolution

To fix, we need to close the extracted zip file before trying to delete it:

Add:

$archiver->getArchive()->close();   // close the opened file before deteling it

Before:

file_unmanaged_delete($file_archive);