bDropFiles                   Exported, Block, User
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   This codeblock is called whenever files are dropped on the window. 
   On evaluation bDropFiles receives three parameters:

          nRow       The row (in pixels) where the file(s) were dropped

          nCol       The column (in pixels) where the file(s) were dropped

          aFileNames This array contains all the file names of the files 
                     that were dropped on the window.