diff --git a/upptst/Stream64PutGet/Stream64PutGet.cpp b/upptst/Stream64PutGet/Stream64PutGet.cpp
new file mode 100644
index 000000000..d274deb4c
--- /dev/null
+++ b/upptst/Stream64PutGet/Stream64PutGet.cpp
@@ -0,0 +1,35 @@
+#include <Core/Core.h>
+
+using namespace Upp;
+
+CONSOLE_APP_MAIN
+{
+	StdLogSetup(LOG_FILE|LOG_COUT);
+	const int64 sz = (int64)5 * 1000 * 1000 * 1000;
+	String path = GetHomeDirFile("test.bin");
+	{
+		Buffer<byte> big(sz);
+		LOG("Allocated");
+		for(int64 i = 0; i < sz; i++) {
+			big[i] = i % 123;
+		}
+		FileOut out(path);
+		out.Put64(big, sz);
+		LOG("Saved");
+	}
+	{
+		FileIn in(path);
+		for(int64 i = 0; i < sz; i++)
+		    ASSERT(in.Get() == i % 123);
+		LOG("Loaded by bytes");
+	}
+	{
+		Buffer<byte> big(sz);
+		FileIn in(path);
+		ASSERT(in.GetAll64(big, sz));
+		LOG("Loaded by GetAll64");
+		for(int64 i = 0; i < sz; i++)
+		    ASSERT(big[i] == i % 123);
+	}
+	LOG("Test passed OK");
+}
diff --git a/upptst/Stream64PutGet/Stream64PutGet.upp b/upptst/Stream64PutGet/Stream64PutGet.upp
new file mode 100644
index 000000000..704badf30
--- /dev/null
+++ b/upptst/Stream64PutGet/Stream64PutGet.upp
@@ -0,0 +1,9 @@
+uses
+	Core;
+
+file
+	Stream64PutGet.cpp;
+
+mainconfig
+	"" = "SSE2";
+
diff --git a/upptst/Stream64PutGet/init b/upptst/Stream64PutGet/init
new file mode 100644
index 000000000..d6a3a9c8c
--- /dev/null
+++ b/upptst/Stream64PutGet/init
@@ -0,0 +1,4 @@
+#ifndef _Stream64PutGet_icpp_init_stub
+#define _Stream64PutGet_icpp_init_stub
+#include "Core/init"
+#endif