diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39e9e7b..3e92dcf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,3 +19,6 @@ cm_example_project(GetCpuInfo)
 
 add_executable(CollectionTest CollectionTest.cpp)
 cm_example_project(CollectionTest)
+
+add_executable(FixFilenameTest FixFilenameTest.cpp)
+cm_example_project(FixFilenameTest)
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diff --git a/FixFilenameTest.cpp b/FixFilenameTest.cpp
new file mode 100644
index 0000000..9b4ed85
--- /dev/null
+++ b/FixFilenameTest.cpp
@@ -0,0 +1,16 @@
+#include<hgl/filesystem/Filename.h>
+#include<iostream>
+
+using namespace std;
+using namespace hgl;
+using namespace hgl::filesystem;
+
+void main()
+{
+    constexpr os_char incorrect_filename[]=OS_TEXT("c:/win95\\\\ms-dos");
+
+    os_out<<OS_TEXT("fix filename test that they have a few problems.\n\n");
+
+    os_out<<OS_TEXT("origin filename: ")<<incorrect_filename<<endl;
+    os_out<<OS_TEXT(" fixed filename: ")<<FixFilename(incorrect_filename).c_str()<<endl;
+}
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