diff --git a/xls/cfb/cfb.go b/xls/cfb/cfb.go
index cc33eb6..2692ba4 100644
--- a/xls/cfb/cfb.go
+++ b/xls/cfb/cfb.go
@@ -125,7 +125,7 @@ func (d *Document) load(rx io.ReadSeeker) error {
 		if h.MajorVersion != 3 && h.MajorVersion != 4 {
 			return errors.New("ole2: unknown major version")
 		}
-		if h.MinorVersion != 0x3E {
+		if h.MinorVersion != 0x3B && h.MinorVersion != 0x3E {
 			log.Printf("WARNING MinorVersion = 0x%02x NOT 0x3E", h.MinorVersion)
 			//return errors.New("ole2: unknown minor version")
 		}
diff --git a/xls/sheets.go b/xls/sheets.go
index 3be1be4..7c58fec 100644
--- a/xls/sheets.go
+++ b/xls/sheets.go
@@ -221,7 +221,7 @@ func (b *WorkBook) parseSheet(s *boundSheet, ss int) (*commonxl.Sheet, error) {
 			if ixfe < len(b.xfs) {
 				fno = b.xfs[ixfe]
 			}
-			if fdata[6] == 0xFF && r.Data[7] == 0xFF {
+			if fdata[6] == 0xFF && fdata[7] == 0xFF {
 				switch fdata[0] {
 				case 0:
 					// string in next record
@@ -244,10 +244,10 @@ func (b *WorkBook) parseSheet(s *boundSheet, ss int) (*commonxl.Sheet, error) {
 				case 3:
 					// blank string
 				default:
-					log.Println("unknown formula value type")
+					log.Printf("unknown formula value type %d", fdata[0])
 				}
 			} else {
-				xnum := binary.LittleEndian.Uint64(r.Data[6:])
+				xnum := binary.LittleEndian.Uint64(fdata[6:])
 				value := math.Float64frombits(xnum)
 				res.Put(int(formulaRow), int(formulaCol), value, fno)
 			}
diff --git a/xls/simple_test.go b/xls/simple_test.go
index 64bccb0..6b0035b 100644
--- a/xls/simple_test.go
+++ b/xls/simple_test.go
@@ -1,117 +1,85 @@
 package xls
 
 import (
+	"os"
+	"strings"
 	"testing"
 )
 
-func TestHeader(t *testing.T) {
-	wb, err := Open("../testdata/test.xls")
-	if err != nil {
-		t.Fatal(err)
-	}
+var testFiles = []string{
+	"../testdata/test.xls",
+	"../testdata/test2.xls",
+	"../testdata/test3.xls",
+	"../testdata/test4.xls",
+	"../testdata/basic.xls",
+	"../testdata/basic2.xls",
+}
 
-	sheets, err := wb.List()
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, s := range sheets {
-		//log.Println(s)
-		sheet, err := wb.Get(s)
+func TestLoading(t *testing.T) {
+	for _, fn := range testFiles {
+		wb, err := Open(fn)
 		if err != nil {
 			t.Fatal(err)
 		}
 
-		for sheet.Next() {
-			sheet.Strings()
+		sheets, err := wb.List()
+		if err != nil {
+			t.Fatal(err)
 		}
-	}
+		for _, s := range sheets {
+			sheet, err := wb.Get(s)
+			if err != nil {
+				t.Fatal(err)
+			}
 
-	err = wb.Close()
-	if err != nil {
-		t.Fatal(err)
+			for sheet.Next() {
+				sheet.Strings()
+			}
+		}
+
+		err = wb.Close()
+		if err != nil {
+			t.Fatal(err)
+		}
 	}
 }
 
-func TestHeader2(t *testing.T) {
-	wb, err := Open("../testdata/test2.xls")
+func noTestBasic(t *testing.T) {
+	trueFile, err := os.ReadFile("../testdata/basic.tsv")
 	if err != nil {
-		t.Fatal(err)
+		t.Skip()
 	}
+	lines := strings.Split(string(trueFile), "\n")
 
-	sheets, err := wb.List()
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, s := range sheets {
-		//log.Println(s)
-		sheet, err := wb.Get(s)
+	for _, fn := range testFiles {
+		wb, err := Open(fn)
 		if err != nil {
 			t.Fatal(err)
 		}
 
-		for sheet.Next() {
-			sheet.Strings()
-		}
-	}
-
-	err = wb.Close()
-	if err != nil {
-		t.Fatal(err)
-	}
-}
-
-func TestHeader3(t *testing.T) {
-	wb, err := Open("../testdata/test3.xls")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	sheets, err := wb.List()
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, s := range sheets {
-		//log.Println(s)
-		sheet, err := wb.Get(s)
+		sheets, err := wb.List()
 		if err != nil {
 			t.Fatal(err)
 		}
+		for _, s := range sheets {
+			sheet, err := wb.Get(s)
+			if err != nil {
+				t.Fatal(err)
+			}
 
-		for sheet.Next() {
-			sheet.Strings()
+			i := 0
+			for sheet.Next() {
+				row := strings.Join(sheet.Strings(), "\t")
+				if lines[i] != row {
+					t.Fatalf("line %d mismatch: '%s' <> '%s'", i, row, lines[i])
+				}
+				i++
+			}
 		}
-	}
 
-	err = wb.Close()
-	if err != nil {
-		t.Fatal(err)
-	}
-}
-
-func TestHeader4(t *testing.T) {
-	wb, err := Open("../testdata/test4.xls")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	sheets, err := wb.List()
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, s := range sheets {
-		//log.Println(s)
-		sheet, err := wb.Get(s)
+		err = wb.Close()
 		if err != nil {
 			t.Fatal(err)
 		}
-
-		for sheet.Next() {
-			sheet.Strings()
-		}
-	}
-
-	err = wb.Close()
-	if err != nil {
-		t.Fatal(err)
 	}
 }