pakmanaged.js
function unlinkSync(file) {
      try {
        fs.unlinkSync(file);
      } catch(e) {
        // Try to override file permission
        if (e.code === 'EPERM') {
          fs.chmodSync(file, '0666');
          fs.unlinkSync(file);
        } else {
          throw e;
        }
      }
    }
function unlinkSync(file) {
      try {
        fs.unlinkSync(file);
      } catch(e) {
        // Try to override file permission
        if (e.code === 'EPERM') {
          fs.chmodSync(file, '0666');
          fs.unlinkSync(file);
        } else {
          throw e;
        }
      }
    }
Normalizes _unlinkSync() across platforms to match Unix behavior, i.e. file can be unlinked even if it's read-only, see https://github.com/joyent/node/issues/3006