diff --git a/SabreTools.Library/DatFiles/Listxml.cs b/SabreTools.Library/DatFiles/Listxml.cs
index 237b540a..8281c544 100644
--- a/SabreTools.Library/DatFiles/Listxml.cs
+++ b/SabreTools.Library/DatFiles/Listxml.cs
@@ -580,6 +580,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);
diff --git a/SabreTools.Library/DatFiles/Logiqx.cs b/SabreTools.Library/DatFiles/Logiqx.cs
index 189276cd..a5d14575 100644
--- a/SabreTools.Library/DatFiles/Logiqx.cs
+++ b/SabreTools.Library/DatFiles/Logiqx.cs
@@ -682,6 +682,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);
diff --git a/SabreTools.Library/DatFiles/OfflineList.cs b/SabreTools.Library/DatFiles/OfflineList.cs
index ebd04d07..dce1246e 100644
--- a/SabreTools.Library/DatFiles/OfflineList.cs
+++ b/SabreTools.Library/DatFiles/OfflineList.cs
@@ -772,6 +772,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);
diff --git a/SabreTools.Library/DatFiles/OpenMSX.cs b/SabreTools.Library/DatFiles/OpenMSX.cs
index 1f18d277..abb00766 100644
--- a/SabreTools.Library/DatFiles/OpenMSX.cs
+++ b/SabreTools.Library/DatFiles/OpenMSX.cs
@@ -542,6 +542,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);
diff --git a/SabreTools.Library/DatFiles/SabreDat.cs b/SabreTools.Library/DatFiles/SabreDat.cs
index 5fcb4e4f..8d4c41f8 100644
--- a/SabreTools.Library/DatFiles/SabreDat.cs
+++ b/SabreTools.Library/DatFiles/SabreDat.cs
@@ -568,6 +568,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);
diff --git a/SabreTools.Library/DatFiles/SoftwareList.cs b/SabreTools.Library/DatFiles/SoftwareList.cs
index f4ea6c49..a310ed35 100644
--- a/SabreTools.Library/DatFiles/SoftwareList.cs
+++ b/SabreTools.Library/DatFiles/SoftwareList.cs
@@ -576,6 +576,8 @@ namespace SabreTools.Library.DatFiles
 
                 XmlTextWriter xtw = new XmlTextWriter(fs, new UTF8Encoding(false));
                 xtw.Formatting = Formatting.Indented;
+                xtw.IndentChar = '\t';
+                xtw.Indentation = 1;
 
                 // Write out the header
                 WriteHeader(xtw);