diff --git a/src/main/scala/li/cil/oc/server/fs/CC15FileSystem.scala b/src/main/scala/li/cil/oc/server/fs/CC15FileSystem.scala
index 3d8708c8b..e8440451a 100644
--- a/src/main/scala/li/cil/oc/server/fs/CC15FileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/CC15FileSystem.scala
@@ -26,7 +26,7 @@ class CC15FileSystem(val mount: IMount) extends InputStreamFileSystem {
   // ----------------------------------------------------------------------- //
 
   protected def openInputChannel(path: String) = try {
-    Some(new InputFileChannel(mount.openForRead(path)))
+    Some(new InputStreamChannel(mount.openForRead(path)))
   } catch {
     case _: Throwable => None
   }
diff --git a/src/main/scala/li/cil/oc/server/fs/CC16FileSystem.scala b/src/main/scala/li/cil/oc/server/fs/CC16FileSystem.scala
index e412dd54b..0ea017cc3 100644
--- a/src/main/scala/li/cil/oc/server/fs/CC16FileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/CC16FileSystem.scala
@@ -26,7 +26,7 @@ class CC16FileSystem(val mount: IMount) extends InputStreamFileSystem {
   // ----------------------------------------------------------------------- //
 
   protected def openInputChannel(path: String) = try {
-    Some(new InputFileChannel(mount.openForRead(path)))
+    Some(new InputStreamChannel(mount.openForRead(path)))
   } catch {
     case _: Throwable => None
   }
diff --git a/src/main/scala/li/cil/oc/server/fs/CompositeReadOnlyFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/CompositeReadOnlyFileSystem.scala
index 12cf6ad55..86840765e 100644
--- a/src/main/scala/li/cil/oc/server/fs/CompositeReadOnlyFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/CompositeReadOnlyFileSystem.scala
@@ -35,16 +35,26 @@ class CompositeReadOnlyFileSystem(factories: mutable.LinkedHashMap[String, Calla
 
   override def lastModified(path: String) = findFileSystem(path).fold(0L)(_.lastModified(path))
 
-  override def list(path: String) = parts.values.foldLeft(Array.empty[String])((acc, fs) => {
-    if (fs.exists(path)) try {
-      val l = fs.list(path)
-      if (l != null) acc ++ l else acc
-    }
-    catch {
-      case _: Throwable => acc
-    }
-    else acc
-  })
+  override def list(path: String) = if (isDirectory(path)) {
+    parts.values.foldLeft(mutable.Set.empty[String])((acc, fs) => {
+      if (fs.exists(path)) try {
+        val l = fs.list(path)
+        if (l != null) for (e <- l) {
+          val f = e.stripSuffix("/")
+          val d = f + "/"
+          // Avoid duplicates and always only use the latest entry.
+          acc -= f
+          acc -= d
+          acc += e
+        }
+      }
+      catch {
+        case _: Throwable =>
+      }
+      acc
+    }).toArray
+  }
+  else null
 
   // ----------------------------------------------------------------------- //
 
diff --git a/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
index 33dfa1988..56322c7d4 100644
--- a/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
@@ -1,7 +1,6 @@
 package li.cil.oc.server.fs
 
 import java.io
-import java.nio.channels.SeekableByteChannel
 
 trait FileInputStreamFileSystem extends InputStreamFileSystem {
   protected val root: io.File
@@ -44,6 +43,23 @@ trait FileInputStreamFileSystem extends InputStreamFileSystem {
 
   // ----------------------------------------------------------------------- //
 
-  override protected def openInputChannel(path: String): Option[SeekableByteChannel] =
-    Some(new io.RandomAccessFile(new io.File(root, path), "r").getChannel)
+  override protected def openInputChannel(path: String) = Some(new FileChannel(new io.File(root, path)))
+
+  protected class FileChannel(file: io.File) extends InputChannel {
+    val channel = new io.RandomAccessFile(file, "r").getChannel
+
+    override def position(newPosition: Long) = {
+      channel.position(newPosition)
+      channel.position
+    }
+
+    override def position = channel.position
+
+    override def close() = channel.close()
+
+    override def isOpen = channel.isOpen
+
+    override def read(dst: Array[Byte]) = channel.read(java.nio.ByteBuffer.wrap(dst))
+  }
+
 }
diff --git a/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
index fe06064c1..f9fa39c5f 100644
--- a/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/InputStreamFileSystem.scala
@@ -5,7 +5,7 @@ import li.cil.oc.api
 import li.cil.oc.api.fs.Mode
 import net.minecraft.nbt.{NBTTagList, NBTTagCompound}
 import scala.collection.mutable
-import java.nio.channels.SeekableByteChannel
+import java.nio.channels.ReadableByteChannel
 import java.nio.ByteBuffer
 
 trait InputStreamFileSystem extends api.fs.FileSystem {
@@ -76,49 +76,61 @@ trait InputStreamFileSystem extends api.fs.FileSystem {
 
   // ----------------------------------------------------------------------- //
 
-  protected def openInputChannel(path: String): Option[SeekableByteChannel]
+  protected def openInputChannel(path: String): Option[InputChannel]
 
-  protected class InputFileChannel(val inputStream: java.io.InputStream) extends SeekableByteChannel {
+  protected trait InputChannel extends ReadableByteChannel {
+    def isOpen: Boolean
+
+    def close()
+
+    def position: Long
+
+    def position(newPosition: Long): Long
+
+    def read(dst: Array[Byte]): Int
+
+    override def read(dst: ByteBuffer) = {
+      if (dst.hasArray) {
+        read(dst.array())
+      }
+      else {
+        val count = dst.limit - dst.position
+        val buffer = new Array[Byte](count)
+        val n = read(buffer)
+        dst.put(buffer, 0, n)
+        n
+      }
+    }
+  }
+
+  protected class InputStreamChannel(val inputStream: java.io.InputStream) extends InputChannel {
     var isOpen = true
 
     private var position_ = 0L
 
-    override def close() = inputStream.close()
-
-    override def truncate(size: Long) = throw new java.io.IOException()
-
-    override def size() = inputStream.available()
-
-    override def position(newPosition: Long) = {
-      inputStream.reset()
-      position_ = inputStream.skip(newPosition)
-      this
+    override def close() = if (isOpen) {
+      isOpen = false
+      inputStream.close()
     }
 
     override def position = position_
 
-    override def write(src: ByteBuffer) = throw new java.io.IOException()
+    override def position(newPosition: Long) = {
+      inputStream.reset()
+      position_ = inputStream.skip(newPosition)
+      position_
+    }
 
-    override def read(dst: ByteBuffer): Int = {
-      if (dst.hasArray) {
-        inputStream.read(dst.array())
-      }
-      else {
-        val count = dst.limit - dst.position
-        for (i <- 0 until count) {
-          inputStream.read match {
-            case -1 => return i
-            case b => dst.put(b.toByte)
-          }
-        }
-        count
-      }
+    override def read(dst: Array[Byte]) = {
+      val read = inputStream.read(dst)
+      position_ += read
+      read
     }
   }
 
   // ----------------------------------------------------------------------- //
 
-  private class Handle(val owner: InputStreamFileSystem, val handle: Int, val path: String, val channel: SeekableByteChannel) extends api.fs.Handle {
+  private class Handle(val owner: InputStreamFileSystem, val handle: Int, val path: String, val channel: InputChannel) extends api.fs.Handle {
     override def position = channel.position
 
     override def length = owner.size(path)
@@ -128,14 +140,9 @@ trait InputStreamFileSystem extends api.fs.FileSystem {
       channel.close()
     }
 
-    override def read(into: Array[Byte]) = {
-      channel.read(ByteBuffer.wrap(into))
-    }
+    override def read(into: Array[Byte]) = channel.read(into)
 
-    override def seek(to: Long) = {
-      channel.position(to)
-      channel.position
-    }
+    override def seek(to: Long) = channel.position(to)
 
     override def write(value: Array[Byte]) = throw new IOException("bad file descriptor")
   }
diff --git a/src/main/scala/li/cil/oc/server/fs/VirtualFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/VirtualFileSystem.scala
index 9692a67e9..4ed8e0864 100644
--- a/src/main/scala/li/cil/oc/server/fs/VirtualFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/VirtualFileSystem.scala
@@ -99,7 +99,7 @@ trait VirtualFileSystem extends OutputStreamFileSystem {
 
   protected def openInputChannel(path: String) =
     root.get(segments(path)) match {
-      case Some(obj: VirtualFile) => obj.openInputStream().map(new InputFileChannel(_))
+      case Some(obj: VirtualFile) => obj.openInputStream().map(new InputStreamChannel(_))
       case _ => None
     }
 
diff --git a/src/main/scala/li/cil/oc/server/fs/ZipFileInputStreamFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/ZipFileInputStreamFileSystem.scala
index 9467d6128..790cd5761 100644
--- a/src/main/scala/li/cil/oc/server/fs/ZipFileInputStreamFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/ZipFileInputStreamFileSystem.scala
@@ -59,7 +59,7 @@ class ZipFileInputStreamFileSystem(private val archive: ArchiveDirectory) extend
   // ----------------------------------------------------------------------- //
 
   override protected def openInputChannel(path: String) = ZipFileInputStreamFileSystem.synchronized {
-    entry(path).map(entry => new InputFileChannel(entry.openStream()))
+    entry(path).map(entry => new InputStreamChannel(entry.openStream()))
   }
 
   // ----------------------------------------------------------------------- //