diff --git a/regress/unittests/win32compat/file_tests.c b/regress/unittests/win32compat/file_tests.c
index aa69c61..22c1b3f 100644
--- a/regress/unittests/win32compat/file_tests.c
+++ b/regress/unittests/win32compat/file_tests.c
@@ -71,21 +71,28 @@ void file_simple_fileio()
 
 	int f;
 	TEST_START("file io");
-	f = open("e:\\tmp.txt", O_WRONLY | O_CREAT | O_TRUNC);
+	f = open("tmp.txt", O_WRONLY | O_CREAT | O_TRUNC);
 	ASSERT_INT_NE(f, -1);
 	close(f);
-	f = open("e:\\tmp.txt", O_RDONLY);
+	f = open("tmp.txt", O_RDONLY);
 	ASSERT_INT_NE(f, -1);
+	struct stat st;
+	ret = fstat(f, &st);
+	ASSERT_INT_EQ(ret, 0);
+	ASSERT_INT_EQ(st.st_size, 0);
 	ret = read(f, small_read_buf, SMALL_RECV_BUF_SIZE);
 	ASSERT_INT_EQ(ret, 0);
 	close(f);
-	f = open("e:\\tmp.txt", O_WRONLY | O_CREAT | O_TRUNC);
+	f = open("tmp.txt", O_WRONLY | O_CREAT | O_TRUNC);
 	ASSERT_INT_NE(f, -1);
 	ret = write(f, small_write_buf, strlen(small_write_buf));
 	ASSERT_INT_EQ(ret, strlen(small_write_buf));
 	close(f);
-	f = open("e:\\tmp.txt", O_RDONLY);
+	f = open("tmp.txt", O_RDONLY);
 	ASSERT_INT_NE(f, -1);
+	ret = fstat(f, &st);
+	ASSERT_INT_EQ(ret, 0);
+	ASSERT_INT_EQ(st.st_size, strlen(small_write_buf));
 	ret = read(f, small_read_buf, SMALL_RECV_BUF_SIZE);
 	ASSERT_INT_EQ(ret, strlen(small_write_buf));
 	small_read_buf[ret] = '\0';
@@ -222,7 +229,7 @@ void
 file_tests()
 {
 	w32posix_initialize();
-	//file_simple_fileio();
+	file_simple_fileio();
 	file_blocking_io_tests();
 	file_nonblocking_io_tests();
 	file_select_tests();