Up until the 2007 version, Microsoft Excel used a proprietary binary file format called Excel Binary File Format (.XLS) as its primary format. Microsoft Excel 2007, along with the other products in the Microsoft Office 2007 suite, introduced new file formats. The first of these (.xlsx) is defined in the Office Open XML (OOXML) specification.
After splitting Excel file in GUI, and Saving "split Excel file" session, then you can:
After splitting Excel file in Command Line, then you can schedule and automate "split Excel file" conversion task by: