1- New :
This menu option will reset all of the values for the currently selected operation as if you wanted to start a new. Therefore, for example, if you are working with the split operation, then selected file in the text box will be cleared, the target file name will be cleared, and the rest of the values will be reset to the their specified defaults.
2- Open :
This menu option will allow you to select a file to work on. For example, when you are in the split window and you select a file with the open menu item, the file selected will be in the text of file to split.
3- Exit :
As the name implies, select this option to exit Quick Split.