diff --git a/PCK-Studio/Forms/Editor/GameRuleFileEditor.cs b/PCK-Studio/Forms/Editor/GameRuleFileEditor.cs
index ff2acc18..d4daade9 100644
--- a/PCK-Studio/Forms/Editor/GameRuleFileEditor.cs
+++ b/PCK-Studio/Forms/Editor/GameRuleFileEditor.cs
@@ -132,7 +132,7 @@ namespace PckStudio.Forms.Editor
 
         private void SetCompressionLevel()
         {
-            switch (_file.FileHeader.CompressionLevel)
+            switch (_file.Header.CompressionLevel)
             {
                 case GameRuleFile.CompressionLevel.None:
                     noneToolStripMenuItem.Checked = true;
@@ -263,7 +263,7 @@ namespace PckStudio.Forms.Editor
 
         private void saveToolStripMenuItem_Click(object sender, EventArgs e)
         {
-            if (_file.FileHeader.unknownData[3] != 0)
+            if (_file.Header.unknownData[3] != 0)
             {
                 MessageBox.Show("World grf saving is currently unsupported");
                 return;
diff --git a/Vendor/OMI-Lib b/Vendor/OMI-Lib
index a154ce2b..c33a6ada 160000
--- a/Vendor/OMI-Lib
+++ b/Vendor/OMI-Lib
@@ -1 +1 @@
-Subproject commit a154ce2b8987ddcc625b6314cfa5aa26972e790d
+Subproject commit c33a6adafe24d7dbbbc2503e5470d348b6bdb1c4