diff --git a/OpenRA.FileFormats/Filesystem/ZipFile.cs b/OpenRA.FileFormats/Filesystem/ZipFile.cs
index 0cd43ecbee..e1c57801dc 100644
--- a/OpenRA.FileFormats/Filesystem/ZipFile.cs
+++ b/OpenRA.FileFormats/Filesystem/ZipFile.cs
@@ -17,15 +17,18 @@ namespace OpenRA.FileFormats
 {
 	public class ZipFile : IFolder
 	{
-		readonly SZipFile pkg;
+		string filename;
+		SZipFile pkg;
 		int priority;
 
 		public ZipFile(string filename, int priority)
 		{
+			this.filename = filename;
 			this.priority = priority;
 			try
 			{
-				pkg = new SZipFile(File.OpenRead(filename));
+				// pull the file into memory, dont keep it open.
+				pkg = new SZipFile(new MemoryStream(File.ReadAllBytes(filename)));
 			}
 			catch (ZipException e)
 			{
@@ -46,15 +49,18 @@ namespace OpenRA.FileFormats
 
 		public Stream GetContent(string filename)
 		{
-			var ms = new MemoryStream();
-			var z = pkg.GetInputStream(pkg.GetEntry(filename));
-			int bufSize = 2048;
-			byte[] buf = new byte[bufSize];
-			while ((bufSize = z.Read(buf, 0, buf.Length)) > 0)
-				ms.Write(buf, 0, bufSize);
-			
-			ms.Seek(0, SeekOrigin.Begin);
-			return ms;
+
+			using (var z = pkg.GetInputStream(pkg.GetEntry(filename)))
+			{
+				var ms = new MemoryStream();
+				int bufSize = 2048;
+				byte[] buf = new byte[bufSize];
+				while ((bufSize = z.Read(buf, 0, buf.Length)) > 0)
+					ms.Write(buf, 0, bufSize);
+
+				ms.Seek(0, SeekOrigin.Begin);
+				return ms;
+			}
 		}
 
 		public IEnumerable<uint> AllFileHashes()
@@ -75,14 +81,21 @@ namespace OpenRA.FileFormats
 		
 		public void Write(Dictionary<string, byte[]> contents)
 		{
+			pkg.Close();
+
+			pkg = SZipFile.Create(filename);
+
 			pkg.BeginUpdate();
 			// TODO: Clear existing content?
-			
+
 			foreach (var kvp in contents)
-			{
 				pkg.Add(new StaticMemoryDataSource(kvp.Value), kvp.Key);
-			}
+
 			pkg.CommitUpdate();
+
+			pkg.Close();
+
+			pkg = new SZipFile(new MemoryStream(File.ReadAllBytes(filename)));
 		}
 	}
 
diff --git a/OpenRA.Game/Map.cs b/OpenRA.Game/Map.cs
index a9ad6b3f6a..4598a9934f 100644
--- a/OpenRA.Game/Map.cs
+++ b/OpenRA.Game/Map.cs
@@ -16,6 +16,7 @@ using System.Linq;
 using System.Reflection;
 using System.Security.Cryptography;
 using OpenRA.FileFormats;
+using System.Text;
 
 namespace OpenRA
 {
@@ -202,7 +203,7 @@ namespace OpenRA
 			var root = new List<MiniYamlNode>();
 			foreach (var field in new string[] {"Selectable", "MapFormat", "Title", "Description", "Author", "PlayerCount", "Tileset", "MapSize", "TopLeft", "BottomRight", "UseAsShellmap", "Type"})
 			{
-				FieldInfo f = this.GetType().GetField(field);
+				var f = this.GetType().GetField(field);
 				if (f.GetValue(this) == null) continue;
 				root.Add( new MiniYamlNode( field, FieldSaver.FormatValue( this, f ) ) );
 			}
@@ -227,7 +228,7 @@ namespace OpenRA
 			Dictionary<string, byte[]> entries = new Dictionary<string, byte[]>();
 			entries.Add("map.bin", SaveBinaryData());
 			var s = root.WriteToString();
-			entries.Add("map.yaml", System.Text.Encoding.UTF8.GetBytes(s));
+			entries.Add("map.yaml", Encoding.UTF8.GetBytes(s));
 			
 			// Saving the map to a new location
 			if (toPath != Path)
diff --git a/mods/ra/maps/a-path-beyond.oramap b/mods/ra/maps/a-path-beyond.oramap
index de342aa0b6..8540b64eb0 100644
Binary files a/mods/ra/maps/a-path-beyond.oramap and b/mods/ra/maps/a-path-beyond.oramap differ
diff --git a/mods/ra/maps/coastal-influence.oramap b/mods/ra/maps/coastal-influence.oramap
index 0c6ec3e529..13edb3e9cb 100644
Binary files a/mods/ra/maps/coastal-influence.oramap and b/mods/ra/maps/coastal-influence.oramap differ