>I am getting an OLE sharing violation error, although my EXCEL file is closed as demonstrated by the code below. The OLE Error occurs when using the APPEND FROM command in the bottom portion of the code. The specific error states: "OLE error code 0x80030020: A share violation has occurred."
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>Is there some possibility that the oExcel.Quit command doesn't close the EXCEL file?

Maybe not immediately? Excel, just like any other sufficiently complicated app, creates temp files, creates a lock file etc - and has to clean up on exit. Perhaps it closes the sheet itself last, and the .quit() returns .t. immediately - while in the background the actual shutdown may take some time.

You may try some delay, perhaps. Or check whether fopen() of the .xls file triggers any errors, in a timed loop.