diff --git a/code/ColladaExporter.cpp b/code/ColladaExporter.cpp
index 763480650..19f86fcf8 100644
--- a/code/ColladaExporter.cpp
+++ b/code/ColladaExporter.cpp
@@ -58,6 +58,9 @@ void ExportSceneCollada(const char* pFile,IOSystem* pIOSystem, const aiScene* pS
 
 	// we're still here - export successfully completed. Write result to the given IOSYstem
 	boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+	if(outfile == NULL) {
+		throw DeadlyExportError("could not open output .dae file: " + std::string(pFile));
+	}
 
 	// XXX maybe use a small wrapper around IOStream that behaves like std::stringstream in order to avoid the extra copy.
 	outfile->Write( iDoTheExportThing.mOutput.str().c_str(), static_cast<size_t>(iDoTheExportThing.mOutput.tellp()),1);
diff --git a/code/ObjExporter.cpp b/code/ObjExporter.cpp
index 4bd65a338..9ac902ee3 100644
--- a/code/ObjExporter.cpp
+++ b/code/ObjExporter.cpp
@@ -59,10 +59,16 @@ void ExportSceneObj(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene
 	// we're still here - export successfully completed. Write both the main OBJ file and the material script
 	{
 		boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+		if(outfile == NULL) {
+			throw DeadlyExportError("could not open output .obj file: " + std::string(pFile));
+		}
 		outfile->Write( exporter.mOutput.str().c_str(), static_cast<size_t>(exporter.mOutput.tellp()),1);
 	}
 	{
 		boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(exporter.GetMaterialLibFileName(),"wt"));
+		if(outfile == NULL) {
+			throw DeadlyExportError("could not open output .mtl file: " + std::string(exporter.GetMaterialLibFileName()));
+		}
 		outfile->Write( exporter.mOutputMat.str().c_str(), static_cast<size_t>(exporter.mOutputMat.tellp()),1);
 	}
 }
diff --git a/code/PlyExporter.cpp b/code/PlyExporter.cpp
index df06175d2..257e6f1f7 100644
--- a/code/PlyExporter.cpp
+++ b/code/PlyExporter.cpp
@@ -57,6 +57,10 @@ void ExportScenePly(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene
 
 	// we're still here - export successfully completed. Write the file.
 	boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+	if(outfile == NULL) {
+		throw DeadlyExportError("could not open output .ply file: " + std::string(pFile));
+	}
+
 	outfile->Write( exporter.mOutput.str().c_str(), static_cast<size_t>(exporter.mOutput.tellp()),1);
 }
 
diff --git a/code/STLExporter.cpp b/code/STLExporter.cpp
index b71cea66e..521f28ae3 100644
--- a/code/STLExporter.cpp
+++ b/code/STLExporter.cpp
@@ -57,6 +57,10 @@ void ExportSceneSTL(const char* pFile,IOSystem* pIOSystem, const aiScene* pScene
 
 	// we're still here - export successfully completed. Write the file.
 	boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+	if(outfile == NULL) {
+		throw DeadlyExportError("could not open output .stl file: " + std::string(pFile));
+	}
+
 	outfile->Write( exporter.mOutput.str().c_str(), static_cast<size_t>(exporter.mOutput.tellp()),1);
 }