diff --git a/druntime/src/core/sys/windows/commctrl.d b/druntime/src/core/sys/windows/commctrl.d
index fe4ebbc75d8..073587f01c1 100644
--- a/druntime/src/core/sys/windows/commctrl.d
+++ b/druntime/src/core/sys/windows/commctrl.d
@@ -5014,7 +5014,7 @@ BOOL Animate_Seek(HWND hwnd, int frame) {
     return Animate_Play(hwnd, frame, frame, 1);
 }
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     HBITMAP CreateMappedBitmap(HINSTANCE, INT_PTR, UINT, LPCOLORMAP, int);
     HWND CreateStatusWindowA(LONG, LPCSTR, HWND, UINT);
     HWND CreateStatusWindowW(LONG, LPCWSTR, HWND, UINT);
@@ -5068,7 +5068,7 @@ BOOL DateTime_SetSystemtime(HWND hwnd, WPARAM flag, LPSYSTEMTIME lpSysTime) {
       cast(LPARAM) lpSysTime);
 }
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     void DrawInsert(HWND, HWND, int);
     void DrawStatusTextA(HDC, LPRECT, LPCSTR, UINT);
     void DrawStatusTextW(HDC, LPRECT, LPCWSTR, UINT);
@@ -5142,7 +5142,7 @@ static if (_WIN32_IE >= 0x400) {
     }
 }
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     HDSA DSA_Create(INT, INT);
     BOOL DSA_Destroy(HDSA);
     VOID DSA_DestroyCallback(HDSA, PFNDSAENUMCALLBACK, PVOID);
@@ -5758,7 +5758,7 @@ BOOL MonthCal_SetRange(HWND w, DWORD f, LPSYSTEMTIME st) {
       cast(LPARAM) st);
 }
 
-extern (Windows) BOOL ShowHideMenuCtl(HWND, UINT_PTR, PINT);
+extern (Windows) nothrow @nogc BOOL ShowHideMenuCtl(HWND, UINT_PTR, PINT);
 
 BOOL TabCtrl_GetItem(HWND w, int i, LPTCITEM p) {
     return cast(BOOL) SendMessage(w, TCM_GETITEM, i, cast(LPARAM) p);
@@ -6069,7 +6069,7 @@ static if (_WIN32_IE >= 0x300) {
         return cast(BOOL) SendMessage(w, LVM_SETITEMCOUNT, i, cast(LPARAM) f);
     }
 
-    extern (Windows) {
+    extern (Windows) nothrow @nogc {
         WINBOOL ImageList_SetImageCount(HIMAGELIST, UINT);
         WINBOOL ImageList_Copy(HIMAGELIST, int, HIMAGELIST, int, UINT);
         WINBOOL ImageList_DrawIndirect(IMAGELISTDRAWPARAMS*);
diff --git a/druntime/src/core/sys/windows/custcntl.d b/druntime/src/core/sys/windows/custcntl.d
index f9234ac4f89..ddac9607382 100644
--- a/druntime/src/core/sys/windows/custcntl.d
+++ b/druntime/src/core/sys/windows/custcntl.d
@@ -99,6 +99,7 @@ extern (Windows) {
     alias INT function(DWORD, DWORD, HFONT, LPWSTR) LPFNCCSIZETOTEXTW;
     alias UINT function(LPCCINFOA) LPFNCCINFOA;
     alias UINT function(LPCCINFOW) LPFNCCINFOW;
+nothrow @nogc:
     UINT CustomControlInfoA(LPCCINFOA acci);
     UINT CustomControlInfoW(LPCCINFOW acci);
 }
diff --git a/druntime/src/core/sys/windows/dde.d b/druntime/src/core/sys/windows/dde.d
index d9b8bec5152..975c62e42f3 100644
--- a/druntime/src/core/sys/windows/dde.d
+++ b/druntime/src/core/sys/windows/dde.d
@@ -148,7 +148,7 @@ deprecated struct DDEUP {
     @property bool   fAckReq(bool f)   { _bf = cast(ushort) ((_bf & ~0x8000) | (f << 15)); return f; }
 }
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     BOOL DdeSetQualityOfService(HWND, const(SECURITY_QUALITY_OF_SERVICE)*,
       PSECURITY_QUALITY_OF_SERVICE);
     BOOL ImpersonateDdeClientWindow(HWND, HWND);
diff --git a/druntime/src/core/sys/windows/ddeml.d b/druntime/src/core/sys/windows/ddeml.d
index 2e8e3ee25d6..0ff1a3f4f1e 100644
--- a/druntime/src/core/sys/windows/ddeml.d
+++ b/druntime/src/core/sys/windows/ddeml.d
@@ -332,7 +332,7 @@ struct MONMSGSTRUCT {
 }
 alias MONMSGSTRUCT* PMONMSGSTRUCT;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     BOOL DdeAbandonTransaction(DWORD, HCONV, DWORD);
     PBYTE DdeAccessData(HDDEDATA, PDWORD);
     HDDEDATA DdeAddData(HDDEDATA, PBYTE, DWORD, DWORD);
diff --git a/druntime/src/core/sys/windows/dhcpcsdk.d b/druntime/src/core/sys/windows/dhcpcsdk.d
index d21169a7346..6171469c8c7 100644
--- a/druntime/src/core/sys/windows/dhcpcsdk.d
+++ b/druntime/src/core/sys/windows/dhcpcsdk.d
@@ -45,7 +45,7 @@ struct DHCPCAPI_PARAMS_ARRAY {
 }
 alias DHCPCAPI_PARAMS_ARRAY* PDHCPCAPI_PARAMS_ARRAY, LPDHCPCAPI_PARAMS_ARRAY;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     void DhcpCApiCleanup();
     DWORD DhcpCApiInitialize(LPDWORD);
     DWORD DhcpDeRegisterParamChange(DWORD, LPVOID, LPVOID);
diff --git a/druntime/src/core/sys/windows/errorrep.d b/druntime/src/core/sys/windows/errorrep.d
index 42fad9a39ec..840ea61f3ce 100644
--- a/druntime/src/core/sys/windows/errorrep.d
+++ b/druntime/src/core/sys/windows/errorrep.d
@@ -29,7 +29,7 @@ enum EFaultRepRetVal {
     frrvOkHeadless // = 7
 }
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     BOOL AddERExcludedApplicationA(LPCSTR);
     BOOL AddERExcludedApplicationW(LPCWSTR);
     EFaultRepRetVal ReportFault(LPEXCEPTION_POINTERS, DWORD);
diff --git a/druntime/src/core/sys/windows/imagehlp.d b/druntime/src/core/sys/windows/imagehlp.d
index 68d88d78780..c6d28e68fd1 100644
--- a/druntime/src/core/sys/windows/imagehlp.d
+++ b/druntime/src/core/sys/windows/imagehlp.d
@@ -295,6 +295,7 @@ extern (Windows) {
     alias BOOL function(DIGEST_HANDLE refdata, PBYTE pData, DWORD dwLength)
       DIGEST_FUNCTION;
 
+nothrow @nogc:
     PIMAGE_NT_HEADERS CheckSumMappedFile(LPVOID, DWORD, LPDWORD, LPDWORD);
     DWORD MapFileAndCheckSumA(LPSTR, LPDWORD, LPDWORD);
     DWORD MapFileAndCheckSumW(PWSTR, LPDWORD, LPDWORD);
diff --git a/druntime/src/core/sys/windows/intshcut.d b/druntime/src/core/sys/windows/intshcut.d
index ab662e418e7..cc4bf623542 100644
--- a/druntime/src/core/sys/windows/intshcut.d
+++ b/druntime/src/core/sys/windows/intshcut.d
@@ -70,7 +70,7 @@ interface IUniformResourceLocator : IUnknown {
 alias IUniformResourceLocator PIUniformResourceLocator,
   PCIUniformResourceLocator;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     BOOL InetIsOffline(DWORD);
     HRESULT MIMEAssociationDialogA(HWND, DWORD, PCSTR, PCSTR, PSTR, UINT);
     HRESULT MIMEAssociationDialogW(HWND, DWORD, PCWSTR, PCWSTR, PWSTR, UINT);
diff --git a/druntime/src/core/sys/windows/iphlpapi.d b/druntime/src/core/sys/windows/iphlpapi.d
index 4a8e64cbef0..d8f0948ca3f 100644
--- a/druntime/src/core/sys/windows/iphlpapi.d
+++ b/druntime/src/core/sys/windows/iphlpapi.d
@@ -13,7 +13,7 @@ version (Windows):
 import core.sys.windows.ipexport, core.sys.windows.iprtrmib, core.sys.windows.iptypes;
 import core.sys.windows.winbase, core.sys.windows.windef;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     DWORD AddIPAddress(IPAddr, IPMask, DWORD, PULONG, PULONG);
     DWORD CreateIpForwardEntry(PMIB_IPFORWARDROW);
     DWORD CreateIpNetEntry(PMIB_IPNETROW);
diff --git a/druntime/src/core/sys/windows/lmaccess.d b/druntime/src/core/sys/windows/lmaccess.d
index 9791ff6e391..cf6f9d4c4d1 100644
--- a/druntime/src/core/sys/windows/lmaccess.d
+++ b/druntime/src/core/sys/windows/lmaccess.d
@@ -708,7 +708,7 @@ struct NETLOGON_INFO_3{
 }
 alias NETLOGON_INFO_3* PNETLOGON_INFO_3;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
 deprecated {
     /* These are obsolete */
     NET_API_STATUS NetAccessAdd(LPCWSTR,DWORD,PBYTE,PDWORD);
diff --git a/druntime/src/core/sys/windows/lmalert.d b/druntime/src/core/sys/windows/lmalert.d
index ad0c3ca7b18..acb96cfbc90 100644
--- a/druntime/src/core/sys/windows/lmalert.d
+++ b/druntime/src/core/sys/windows/lmalert.d
@@ -71,7 +71,7 @@ struct USER_OTHER_INFO{
 }
 alias USER_OTHER_INFO* PUSER_OTHER_INFO, LPUSER_OTHER_INFO;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
 NET_API_STATUS NetAlertRaise(LPCWSTR,PVOID,DWORD);
 NET_API_STATUS NetAlertRaiseEx(LPCWSTR,PVOID,DWORD,LPCWSTR);
 }
diff --git a/druntime/src/core/sys/windows/lmapibuf.d b/druntime/src/core/sys/windows/lmapibuf.d
index e8559543f3e..85ccd1f49f2 100644
--- a/druntime/src/core/sys/windows/lmapibuf.d
+++ b/druntime/src/core/sys/windows/lmapibuf.d
@@ -12,7 +12,7 @@ pragma(lib, "netapi32");
 
 import core.sys.windows.lmcons, core.sys.windows.windef;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     NET_API_STATUS NetApiBufferAllocate(DWORD, PVOID*);
     NET_API_STATUS NetApiBufferFree(PVOID);
     NET_API_STATUS NetApiBufferReallocate(PVOID, DWORD, PVOID*);
diff --git a/druntime/src/core/sys/windows/lmmsg.d b/druntime/src/core/sys/windows/lmmsg.d
index a3abd605422..eab87882747 100644
--- a/druntime/src/core/sys/windows/lmmsg.d
+++ b/druntime/src/core/sys/windows/lmmsg.d
@@ -32,7 +32,7 @@ struct MSG_INFO_1 {
 }
 alias MSG_INFO_1* PMSG_INFO_1, LPMSG_INFO_1;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     NET_API_STATUS NetMessageBufferSend(LPCWSTR, LPCWSTR, LPCWSTR, PBYTE,
       DWORD);
     NET_API_STATUS NetMessageNameAdd(LPCWSTR, LPCWSTR);
diff --git a/druntime/src/core/sys/windows/lmremutl.d b/druntime/src/core/sys/windows/lmremutl.d
index 8c90df73f2a..196be667fec 100644
--- a/druntime/src/core/sys/windows/lmremutl.d
+++ b/druntime/src/core/sys/windows/lmremutl.d
@@ -52,7 +52,7 @@ struct TIME_OF_DAY_INFO {
 }
 alias TIME_OF_DAY_INFO* PTIME_OF_DAY_INFO, LPTIME_OF_DAY_INFO;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     NET_API_STATUS NetRemoteTOD(LPCWSTR, PBYTE*);
     NET_API_STATUS NetRemoteComputerSupports(LPCWSTR, DWORD, PDWORD);
     NET_API_STATUS RxRemoteApi(DWORD, LPCWSTR, LPDESC, LPDESC, LPDESC,
diff --git a/druntime/src/core/sys/windows/mgmtapi.d b/druntime/src/core/sys/windows/mgmtapi.d
index 8f84eea54e8..336d24e750e 100644
--- a/druntime/src/core/sys/windows/mgmtapi.d
+++ b/druntime/src/core/sys/windows/mgmtapi.d
@@ -29,7 +29,7 @@ enum MGMCTL_SETAGENTPORT = 1;
 
 alias PVOID LPSNMP_MGR_SESSION;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     BOOL SnmpMgrClose(LPSNMP_MGR_SESSION);
     BOOL SnmpMgrCtl(LPSNMP_MGR_SESSION, DWORD, LPVOID, DWORD, LPVOID, DWORD,
       LPDWORD);
diff --git a/druntime/src/core/sys/windows/ntdll.d b/druntime/src/core/sys/windows/ntdll.d
index 28d560c537b..7f0c47a15fc 100644
--- a/druntime/src/core/sys/windows/ntdll.d
+++ b/druntime/src/core/sys/windows/ntdll.d
@@ -19,4 +19,4 @@ enum SHUTDOWN_ACTION {
     ShutdownPowerOff
 }
 
-extern (Windows) uint NtShutdownSystem(SHUTDOWN_ACTION Action);
+extern (Windows) nothrow @nogc uint NtShutdownSystem(SHUTDOWN_ACTION Action);
diff --git a/druntime/src/core/sys/windows/ntsecapi.d b/druntime/src/core/sys/windows/ntsecapi.d
index fa08a74ee5b..77101f669b4 100644
--- a/druntime/src/core/sys/windows/ntsecapi.d
+++ b/druntime/src/core/sys/windows/ntsecapi.d
@@ -726,7 +726,7 @@ struct TRUSTED_DOMAIN_FULL_INFORMATION {
 }
 alias TRUSTED_DOMAIN_FULL_INFORMATION* PTRUSTED_DOMAIN_FULL_INFORMATION;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     NTSTATUS LsaAddAccountRights(LSA_HANDLE, PSID, PLSA_UNICODE_STRING,
       ULONG);
     NTSTATUS LsaCallAuthenticationPackage(HANDLE, ULONG, PVOID, ULONG,
diff --git a/druntime/src/core/sys/windows/prsht.d b/druntime/src/core/sys/windows/prsht.d
index 053b1fa2ac9..570d1689b38 100644
--- a/druntime/src/core/sys/windows/prsht.d
+++ b/druntime/src/core/sys/windows/prsht.d
@@ -331,7 +331,7 @@ struct PSHNOTIFY {
 }
 alias PSHNOTIFY* LPPSHNOTIFY;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     HPROPSHEETPAGE CreatePropertySheetPageA(LPCPROPSHEETPAGEA);
     HPROPSHEETPAGE CreatePropertySheetPageW(LPCPROPSHEETPAGEW);
     BOOL DestroyPropertySheetPage(HPROPSHEETPAGE);
diff --git a/druntime/src/core/sys/windows/rpc.d b/druntime/src/core/sys/windows/rpc.d
index b432bc7c681..3b7e28d213c 100644
--- a/druntime/src/core/sys/windows/rpc.d
+++ b/druntime/src/core/sys/windows/rpc.d
@@ -26,6 +26,6 @@ public import core.sys.windows.winerror;
 alias MIDL_user_allocate midl_user_allocate;
 alias MIDL_user_free midl_user_free;
 
-extern (Windows) {
+extern (Windows) nothrow @nogc {
     int I_RpcMapWin32Status(RPC_STATUS);
 }