diff --git a/ClosedXML/ClosedXML/ClosedXML/Excel/XLWorkbook_Save.cs b/ClosedXML/ClosedXML/ClosedXML/Excel/XLWorkbook_Save.cs
index 1656fe2..1398597 100644
--- a/ClosedXML/ClosedXML/ClosedXML/Excel/XLWorkbook_Save.cs
+++ b/ClosedXML/ClosedXML/ClosedXML/Excel/XLWorkbook_Save.cs
@@ -2466,7 +2466,7 @@
                 numberFormatCount++;
             }
 
-            var allSharedNumberFormats = ResolveNumberFormats(workbookStylesPart, sharedNumberFormats);
+            var allSharedNumberFormats = ResolveNumberFormats(workbookStylesPart, sharedNumberFormats, defaultFormatId);
             ResolveFonts(workbookStylesPart, context);
             var allSharedFills = ResolveFills(workbookStylesPart, sharedFills);
             var allSharedBorders = ResolveBorders(workbookStylesPart, sharedBorders);
@@ -3166,13 +3166,21 @@
 
         private static Dictionary<IXLNumberFormat, NumberFormatInfo> ResolveNumberFormats(
             WorkbookStylesPart workbookStylesPart,
-            Dictionary<IXLNumberFormat, NumberFormatInfo> sharedNumberFormats)
+            Dictionary<IXLNumberFormat, NumberFormatInfo> sharedNumberFormats,
+            UInt32 defaultFormatId)
         {
             if (workbookStylesPart.Stylesheet.NumberingFormats == null)
+            {
                 workbookStylesPart.Stylesheet.NumberingFormats = new NumberingFormats();
+                workbookStylesPart.Stylesheet.NumberingFormats.AppendChild(new NumberingFormat()
+                {
+                    NumberFormatId = 0,
+                    FormatCode = ""
+                });
+            }
 
             var allSharedNumberFormats = new Dictionary<IXLNumberFormat, NumberFormatInfo>();
-            foreach (var numberFormatInfo in sharedNumberFormats.Values)
+            foreach (var numberFormatInfo in sharedNumberFormats.Values.Where(nf => nf.NumberFormatId != defaultFormatId))
             {
                 var numberingFormatId = 164;
                 var foundOne = false;
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
index 554251a..2b7ee46 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Loading/ChangingBasicTable.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/BasicTable.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/BasicTable.xlsx
index 1889154..3a4a2f7 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/BasicTable.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/BasicTable.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CellValues.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CellValues.xlsx
index 6bb0a42..283b632 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CellValues.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CellValues.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CopyingWorksheets.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CopyingWorksheets.xlsx
index e0cfee6..f18e03a 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CopyingWorksheets.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/CopyingWorksheets.xlsx
Binary files differ
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
index f2099c7..b885488 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/LambdaExpressions.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/LambdaExpressions.xlsx
index aaf5a75..bf79366 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/LambdaExpressions.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/LambdaExpressions.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/ShowCase.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/ShowCase.xlsx
index 3875b88..529ee5d 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/ShowCase.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Misc/ShowCase.xlsx
Binary files differ
diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/CopyingRanges.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/CopyingRanges.xlsx
index bd0c2f1..1142171 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/CopyingRanges.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/CopyingRanges.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/ShiftingRanges.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/ShiftingRanges.xlsx
index 48b6f5d..65d84df 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/ShiftingRanges.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/ShiftingRanges.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRanges.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRanges.xlsx
index 30694d6..82ee38c 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRanges.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRanges.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRangesPlus.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRangesPlus.xlsx
index 77d5576..87938f5 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRangesPlus.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/TransposeRangesPlus.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/UsingTables.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/UsingTables.xlsx
index 9e15ca9..1a58ba4 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/UsingTables.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Ranges/UsingTables.xlsx
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diff --git a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Styles/StyleNumberFormat.xlsx b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Styles/StyleNumberFormat.xlsx
index 737c284..43d61e1 100644
--- a/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Styles/StyleNumberFormat.xlsx
+++ b/ClosedXML/ClosedXML/ClosedXML_Tests/Resource/Examples/Styles/StyleNumberFormat.xlsx
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