Writable Lock

[RCMac]

When opening a file "writeable," the app creates a lck (lock) file. However, if the app is exited by using the iOS device "Home" button, the file does not close properly. A subsequent open of the file requires cleaning up of the lck file. Please modify such that pressing Home button, or switching to other iOS app causes the file to auto-close properly (releasing/deleting the .lck file).

Thanks!