diff --git a/src/testcases/org/apache/poi/hssf/data/41546.xls b/src/testcases/org/apache/poi/hssf/data/41546.xls
new file mode 100644
index 000000000..1332f3eef
Binary files /dev/null and b/src/testcases/org/apache/poi/hssf/data/41546.xls differ
diff --git a/src/testcases/org/apache/poi/hssf/data/Bug44593.xls b/src/testcases/org/apache/poi/hssf/data/44593.xls
similarity index 100%
rename from src/testcases/org/apache/poi/hssf/data/Bug44593.xls
rename to src/testcases/org/apache/poi/hssf/data/44593.xls
diff --git a/src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java b/src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java
index f06f591c4..e7eff83e6 100644
--- a/src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java
+++ b/src/testcases/org/apache/poi/hssf/usermodel/TestBugs.java
@@ -1034,6 +1034,28 @@ extends TestCase {
         assertTrue("No Exceptions while reading file", true);
     }
 
+    /**
+     * Bug 41546: Constructing HSSFWorkbook is failed,
+     *  Unknown Ptg in Formula: 0x1a (26)
+     */
+    public void test41546() throws Exception {
+        FileInputStream in = new FileInputStream(new File(cwd, "41546.xls"));
+        HSSFWorkbook wb = new HSSFWorkbook(in);
+        in.close();
+
+        assertTrue("No Exceptions while reading file", true);
+        assertEquals(1, wb.getNumberOfSheets());
+
+        //serialize and read again
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        wb.write(out);
+        out.close();
+
+        wb = new HSSFWorkbook(new ByteArrayInputStream(out.toByteArray()));
+        assertTrue("No Exceptions while reading file", true);
+        assertEquals(1, wb.getNumberOfSheets());
+    }
+
     /**
      * Bug 42564: Some files from Access were giving a RecordFormatException
      *  when reading the BOFRecord
@@ -1157,7 +1179,7 @@ extends TestCase {
      *  probably due to dropdowns
      */
     public void test44593() throws Exception {
-        FileInputStream in = new FileInputStream(new File(cwd, "Bug44593.xls"));
+        FileInputStream in = new FileInputStream(new File(cwd, "44593.xls"));
         
         // Used to blow up with an IllegalArgumentException
         //  when creating a DVRecord