diff --git a/core/sys/windows/types.odin b/core/sys/windows/types.odin
index 8069659c9..888150708 100644
--- a/core/sys/windows/types.odin
+++ b/core/sys/windows/types.odin
@@ -2204,7 +2204,24 @@ DUPLICATE_SAME_ACCESS: DWORD : 0x00000002
 CONDITION_VARIABLE_INIT :: CONDITION_VARIABLE{}
 SRWLOCK_INIT :: SRWLOCK{}
 
-STARTF_USESTDHANDLES: DWORD : 0x00000100
+// Flags in STARTUPINFOW.dwFlags.
+STARTF_USESHOWWINDOW: DWORD :    0x00000001
+STARTF_USESIZE: DWORD :          0x00000002
+STARTF_USEPOSITION: DWORD :      0x00000004
+STARTF_USECOUNTCHARS: DWORD :    0x00000008
+STARTF_USEFILLATTRIBUTE: DWORD : 0x00000010
+STARTF_RUNFULLSCREEN: DWORD :    0x00000020  // ignored for non-x86 platforms
+STARTF_FORCEONFEEDBACK: DWORD :  0x00000040
+STARTF_FORCEOFFFEEDBACK: DWORD : 0x00000080
+STARTF_USESTDHANDLES: DWORD :    0x00000100
+// WINVER >= 0x400
+STARTF_USEHOTKEY: DWORD :        0x00000200
+STARTF_TITLEISLINKNAME: DWORD :  0x00000800
+STARTF_TITLEISAPPID: DWORD :     0x00001000
+STARTF_PREVENTPINNING: DWORD :   0x00002000
+// WINVER >= 0x600
+STARTF_UNTRUSTEDSOURCE: DWORD :  0x00008000
+
 
 VOLUME_NAME_DOS: DWORD : 0x0