Additional logic not required in getWorksheetFromSheet as we correctly read the mapping from the workbook.xml.rels file within the XLSX bundle.

workbook.go

@@ -5,7 +5,6 @@ import (
 	"encoding/xml"
 	"fmt"
 	"io"
-	"strings"
 )
 
 // xmlxWorkbookRels contains xmlxWorkbookRelations
@@ -134,22 +133,7 @@ func getWorksheetFromSheet(sheet xlsxSheet, worksheets map[string]*zip.File, she
 			sheetName = fmt.Sprintf("sheet%s", sheet.Id)
 		}
 	}
-	f, ok := worksheets[sheetName]
-	if !ok {
-		// excel created from mac MsExcel,will have a sheets Id as "rId1",
-		// but has a sheet file named "sheet1" and  "_rels/sheet1.xml."
-		// this work around will open it
-		for sheetName, f = range worksheets {
-			//do not want "_rels/sheet1.xml."
-			if strings.Contains(sheetName, "_") {
-				continue
-			}
-			break
-		}
-		if f == nil {
-			return nil, fmt.Errorf("not found sheet file sheetId:%s", sheet.Id)
-		}
-	}
+	f := worksheets[sheetName]
 	rc, error = f.Open()
 	if error != nil {
 		return nil, error