diff --git a/build.xml b/build.xml
index 3e4037e4d..1e68ea729 100644
--- a/build.xml
+++ b/build.xml
@@ -1002,7 +1002,13 @@ MSIL
       <condition><not><isset property="ilasm.cmd"/></not></condition>
     </fail>
     <!-- Sets ilasm arguments (either Windows or Unix) -->
-    <property name="ilasm.infile" value="${msil.dir}/predef.msil"/>
+    <!-- property name="ilasm.infile" value="${msil.dir}/predef.msil" -->
+    <path id="ilasm.infiles">
+      <fileset dir="${msil.dir}" includes="*.msil"/>
+    </path>
+    <pathconvert property="ilasm.infile" pathsep=" ">
+      <path refid="ilasm.infiles" />
+    </pathconvert>
     <property name="ilasm.outfile" value="${msil.dir}/predef.dll"/>
     <if>
       <isset property="os.win"/>
@@ -1032,8 +1038,8 @@ MSIL
   </target>
 
   <target name="msil.libraries" depends="setup.quick, msil.sources">
-    <quick srcdir="${msil.dir}/src" target="msil"
-           assemname="${msil.dir}/predef" assemrefs="${lib.dir}"
+      <quick srcdir="${msil.dir}/src" destdir="${msil.dir}" target="msil"
+           assemname="predef" assemrefs="${lib.dir}"
            failonerror="false">
       <include name="**/*.scala"/>
       <exclude name="scala/ScalaObject.scala"/>   
@@ -1069,7 +1075,6 @@ MSIL
       <include name="scala/testing/*.scala"/> 
       <include name="scala/text/*.scala"/> -->
     </quick>
-
     <exec
       executable="${ilasm.cmd}" vmlauncher="no">
       <!--
diff --git a/src/compiler/scala/tools/nsc/Settings.scala b/src/compiler/scala/tools/nsc/Settings.scala
index 53dddae18..652a06cbf 100644
--- a/src/compiler/scala/tools/nsc/Settings.scala
+++ b/src/compiler/scala/tools/nsc/Settings.scala
@@ -102,6 +102,7 @@ class Settings(error: String => Unit) {
   
   val assemname     = StringSetting     ("-Xassem", "file", "Name of the output assembly (only relevant with -target:msil)", "").dependsOn(target, "msil")
   val assemrefs     = StringSetting     ("-Xassem-path", "path", "List of assemblies referenced by the program (only relevant with -target:msil)", ".").dependsOn(target, "msil")
+  val keepMsilFiles = BooleanSetting    ("-Xkeep-msil-files", "Keep .msil files after calling ilasm").dependsOn(target, "msil").hideToIDE
   val Xchecknull    = BooleanSetting    ("-Xcheck-null", "Emit warning on selection of nullable reference")
   val noassertions  = BooleanSetting    ("-Xdisable-assertions", "Generate no assertions and assumptions")
   val Xexperimental = BooleanSetting    ("-Xexperimental", "Enable experimental extensions")
diff --git a/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala b/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
index 29cd6233f..d2e23c90f 100644
--- a/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
+++ b/src/compiler/scala/tools/nsc/backend/msil/GenMSIL.scala
@@ -51,7 +51,6 @@ abstract class GenMSIL extends SubComponent {
       classes.values foreach codeGenerator.createTypeBuilder
       classes.values foreach codeGenerator.createClassMembers
 
-
       try {
         classes.values foreach codeGenerator.genClass
       } finally {
@@ -217,12 +216,13 @@ abstract class GenMSIL extends SubComponent {
     var assemName: String = _
     var firstSourceName = ""
     var outDir: File = _
+    var moduleName: String = _
 
     def initAssembly() {
 
       assemName = settings.assemname.value
-      if (assemName == "") {
 
+      if (assemName == "") {
         if (entryPoint != null) {
           assemName = msilName(entryPoint.enclClass)
           // remove the $ at the end (from module-name)
@@ -238,18 +238,16 @@ abstract class GenMSIL extends SubComponent {
         if (assemName.endsWith(".il"))
           assemName = assemName.substring(0, assemName.length()-3)
         val f: File = new File(assemName)
-        outDir = f.getParentFile()
         assemName = f.getName()
       }
-      if (outDir == null)
-        outDir = new File(".")
-
+      
+      outDir = new File(settings.outdir.value)
 
       val assemblyName = new AssemblyName()
       assemblyName.Name = assemName
       massembly = AssemblyBuilder.DefineDynamicAssembly(assemblyName)
 
-      val moduleName = assemName + (if (entryPoint == null) ".dll" else ".exe")
+      moduleName = assemName + (if (entryPoint == null) ".dll" else ".exe")
       // filename here: .dll or .exe (in both parameters), second: give absolute-path
       mmodule = massembly.DefineDynamicModule(moduleName,
                                               new File(outDir, moduleName).getAbsolutePath())
@@ -450,18 +448,22 @@ abstract class GenMSIL extends SubComponent {
         code.Emit(OpCodes.Ret)
       }
       createTypes()
-      val filename = new File(outDir, assemName + ".msil").getPath()
       if (settings.debug.value)
-        log("Output file name: " + filename)
+        log("Output path: " + outDir.getPath)
       try {
-        massembly.Save(filename)
+        massembly.Save(outDir.getPath)
         val ilasm = Properties.msilILasm
         if (ilasm != "") {
-          val cmd = ilasm + " " + filename
+          val generatedFiles = List.fromArray(massembly.GetGeneratedFiles)
+          val cmd = ilasm + " " + (if(entryPoint == null) "/dll" else "/exe") + " /output:" + moduleName + " " + generatedFiles.mkString(" ")
           if (settings.debug.value)
             log("Executing command: " + cmd)
           try {
-            Runtime.getRuntime().exec(cmd)
+            val p = Runtime.getRuntime().exec(cmd)
+            p.waitFor() // wait until ilasm is done
+            if(!settings.keepMsilFiles.value) {
+              generatedFiles.foreach(f => new File(f).delete())
+            }
           } catch {
             case _ =>
               Console.println("Cannot run command: " + cmd)
@@ -469,7 +471,7 @@ abstract class GenMSIL extends SubComponent {
           }
         }
       } catch {
-        case _: Error => abort("Could not save file " + filename)
+        case _: Error => abort("Could not save files in " + outDir.getPath)
       }
     }