diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 313605f0..8dc997b8 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -27,6 +27,8 @@ add_library(appleii SHARED
   linux/benchmark.cpp
   linux/paddle.cpp
   linux/version.cpp
+  linux/stringcb.cpp
+  linux/registry.cpp
 
   Z80VICE/z80.cpp
   Z80VICE/z80mem.cpp
diff --git a/source/linux/registry.cpp b/source/linux/registry.cpp
new file mode 100644
index 00000000..a9ce0e03
--- /dev/null
+++ b/source/linux/registry.cpp
@@ -0,0 +1,18 @@
+#include "linux/wincompat.h"
+#include "linux/stringcb.h"
+#include "linux/interface.h"
+
+BOOL RegLoadString (LPCTSTR section, LPCTSTR key, BOOL peruser, LPTSTR buffer, DWORD chars, LPCTSTR defaultValue)
+{
+	BOOL success = RegLoadString(section, key, peruser, buffer, chars);
+	if (!success)
+		StringCbCopy(buffer, chars, defaultValue);
+	return success;
+}
+
+BOOL RegLoadValue (LPCTSTR section, LPCTSTR key, BOOL peruser, DWORD* value, DWORD defaultValue) {
+	BOOL success = RegLoadValue(section, key, peruser, value);
+	if (!success)
+		*value = defaultValue;
+	return success;
+}
diff --git a/source/linux/stringcb.cpp b/source/linux/stringcb.cpp
new file mode 100644
index 00000000..105339fa
--- /dev/null
+++ b/source/linux/stringcb.cpp
@@ -0,0 +1,16 @@
+#include "linux/stringcb.h"
+#include <cstring>
+
+HRESULT StringCbCopy(char * pszDest, const size_t cbDest, const char * pszSrc)
+{
+  strncpy(pszDest, pszSrc, cbDest - 1);
+  pszDest[cbDest - 1] = '\0';
+  return 0;
+}
+
+HRESULT StringCbCat(char * pszDest, const size_t cbDest, const char * pszSrc)
+{
+  strncat(pszDest, pszSrc, cbDest - strlen(pszDest) - 1);
+  pszDest[cbDest - 1] = '\0';
+  return 0;
+}
diff --git a/source/linux/stringcb.h b/source/linux/stringcb.h
new file mode 100644
index 00000000..0d8443e0
--- /dev/null
+++ b/source/linux/stringcb.h
@@ -0,0 +1,5 @@
+#include "linux/wincompat.h"
+
+HRESULT StringCbCopy(char * pszDest, const size_t cbDest, const char * pszSrc);
+HRESULT StringCbCat(char * pszDest,const size_t cbDest, const char * pszSrc);
+#define StringCbPrintf snprintf
diff --git a/source/linux/wwrapper.h b/source/linux/wwrapper.h
index b92b8acb..ab38b06a 100644
--- a/source/linux/wwrapper.h
+++ b/source/linux/wwrapper.h
@@ -5,6 +5,7 @@
 
 #include "linux/wincompat.h"
 #include "linux/dummies.h"
+#include "linux/stringcb.h"
 #include "minizip/unzip.h"
 
 #define FILE_BEGIN 	SEEK_SET