Excel - Rows and Columns

Hello,

I am trying to open an excel document and then count the total number of Rows and Columns. But somethings i am doing wrong and i get meaningless or same numbers (depents on putting USAGE COMP-3 or not at the end of W-BX-CELL-DATA variable)

77 excel-app handle of application.
77 excel-workbook handle of workbook.
77 excel-sheets handle of sheets.
77 excel-worksheet handle of worksheet.

01 TARGET.
      05 CELL-LETTER1 PIC X VALUE IS " ".
      05 CELL-LETTER2 PIC X.
      05 CELL-NUMBER PIC 9(6).

01 W-BX-CELL-DATA PIC X(100) VALUE SPACES.

******************************now the routine***********************

INQUIRE excel-worksheet @Range(TARGET)::End(xlDown)::Row IN W-BX-CELL-DATA.
MOVE SPACES TO W-BX-CELL-DATA
INQUIRE excel-worksheet @Range(TARGET)::End(xlToRight)::Column IN W-BX-CELL-DATA.