diff --git a/core/sys/windows/psapi.odin b/core/sys/windows/psapi.odin
new file mode 100644
index 00000000000..b70cc42717b
--- /dev/null
+++ b/core/sys/windows/psapi.odin
@@ -0,0 +1,211 @@
+#+build windows
+package sys_windows
+
+import "base:intrinsics"
+import "core:c"
+
+foreign import psapi "system:Psapi.lib"
+
+@(default_calling_convention="system")
+foreign psapi {
+	EnumProcesses :: proc(lpidProcess: PDWORD, cb: DWORD, lpcbNeeded: LPDWORD) -> BOOL ---
+	EnumProcessModules :: proc(hProcess: HANDLE, lphModule: ^HMODULE, cb: DWORD, lpcbNeeded: LPDWORD) -> BOOL ---
+	EnumProcessModulesEx :: proc(hProcess: HANDLE, lphModule: ^HMODULE, cb: DWORD, lpcbNeeded: LPDWORD, dwFilterFlag: DWORD) -> BOOL ---
+
+	GetModuleBaseNameW :: proc(hProcess: HANDLE, hModule: HMODULE, lpBaseName: LPWSTR, nSize: DWORD) -> DWORD ---
+	GetModuleFileNameExW :: proc(hProcess: HANDLE, hModule: HMODULE, lpFilename: LPWSTR, nSize: DWORD) -> DWORD ---
+
+	GetModuleInformation :: proc(hProcess: HANDLE, hModule: HMODULE,lpmodinfo: LPMODULEINFO, cb: DWORD) -> BOOL ---
+
+	EmptyWorkingSet :: proc(hProcess: HANDLE) -> BOOL ---
+	QueryWorkingSet :: proc(hProcess: HANDLE, pv: PVOID, cb: DWORD) -> BOOL ---
+	QueryWorkingSetEx :: proc(hProcess: HANDLE, pv: PVOID, cb: DWORD) -> BOOL ---
+
+	InitializeProcessForWsWatch :: proc(hProces: HANDLE) -> BOOL ---
+	GetWsChanges :: proc(hProcess: HANDLE, lpWatchInfo: PPSAPI_WS_WATCH_INFORMATION, cb: DWORD) -> BOOL ---
+	GetWsChangesEx :: proc(hProcess: HANDLE, lpWatchInfoEx: PPSAPI_WS_WATCH_INFORMATION_EX, cb: PDWORD) -> BOOL ---
+
+	GetMappedFileNameW :: proc (hProcess: HANDLE, lpv: LPVOID, lpFilename: LPWSTR, nSize: DWORD) -> DWORD ---
+
+	EnumDeviceDrivers :: proc (lpImageBase: ^LPVOID, cb: DWORD, lpcbNeeded: LPDWORD) -> BOOL ---
+	GetDeviceDriverBaseNameW :: proc (lpImageBase: LPVOID, lpBaseName: LPWSTR, nSize: DWORD) -> DWORD ---
+	GetDeviceDriverFileNameW :: proc (lpImageBase: LPVOID, lpFilename: LPWSTR, nSize: DWORD) -> DWORD ---
+
+	GetProcessMemoryInfo :: proc(hProcess: HANDLE, ppsmemCounters: PPROCESS_MEMORY_COUNTERS, cb: DWORD) -> BOOL ---
+
+	GetPerformanceInfo :: proc(pPerformanceInformation: PPERFORMANCE_INFORMATION, cb: DWORD) -> BOOL ---
+	EnumPageFilesW :: proc(pCallBackRoutine: Enum_Page_File_Callback, pContext: LPVOID) -> BOOL ---
+	GetProcessImageFileNameW :: proc (hProcess: HANDLE, lpImageFileName: LPWSTR, nSize: DWORD) -> DWORD ---
+}
+
+GetModuleBaseName :: GetModuleBaseNameW
+GetModuleFileNameEx :: GetModuleFileNameExW
+GetMappedFileName :: GetMappedFileNameW
+GetDeviceDriverBaseName :: GetDeviceDriverBaseNameW
+GetDeviceDriverFileName :: GetDeviceDriverFileNameW
+EnumPageFiles :: EnumPageFilesW
+GetProcessImageFileName :: GetProcessImageFileNameW
+
+MODULEINFO :: struct {
+	lpBaseOfDll: LPVOID,
+	SizeOfImage: DWORD,
+	EntryPoint:  LPVOID,
+}
+LPMODULEINFO :: ^MODULEINFO
+
+when ODIN_ARCH == .amd64 { 
+	PSAPI_WORKING_SET_BLOCK :: struct #raw_union {
+		Flags: ULONG_PTR,
+		using DUMMYNAME : bit_field uintptr {
+			Proctection: ULONG_PTR | 5,
+			ShareCount:  ULONG_PTR | 3,
+			Shared:      ULONG_PTR | 1,
+			Reserved:    ULONG_PTR | 3,
+			VirtualPage: ULONG_PTR | 52,
+		},
+	}
+
+	PSAPI_WORKING_SET_EX_BLOCK :: struct #raw_union {
+		Flags: ULONG_PTR,
+		using DUMMYNAME : bit_field uintptr {
+			Valid:           ULONG_PTR | 1,
+			ShareCount:      ULONG_PTR | 3,
+			Win32Protection: ULONG_PTR | 11,
+			Shared:          ULONG_PTR | 1,
+			Node:            ULONG_PTR | 6,
+			Locked:          ULONG_PTR | 1,
+			LargePage:       ULONG_PTR | 1,
+			Reserved:        ULONG_PTR | 7,
+			Bad:             ULONG_PTR | 1,
+			ReservedUlong:   ULONG_PTR | 32,
+		},
+		Invalid: bit_field uintptr {
+			Valid:         ULONG_PTR | 1,
+			Reserved0:     ULONG_PTR | 14,
+			Shared:        ULONG_PTR | 1,
+			Reserved1:     ULONG_PTR | 15,
+			Bad:           ULONG_PTR | 1,
+			ReservedUlong: ULONG_PTR | 32,
+		},
+	}
+} else when ODIN_ARCH == .i386 {
+	PSAPI_WORKING_SET_BLOCK :: struct #raw_union {
+		Flags: ULONG_PTR,
+		using DUMMYNAME : bit_field uintptr {
+			Proctection: ULONG_PTR | 5,
+			ShareCount:  ULONG_PTR | 3,
+			Shared:      ULONG_PTR | 1,
+			Reserved:    ULONG_PTR | 3,
+			VirtualPage: ULONG_PTR | 20,
+		},
+	}
+
+	PSAPI_WORKING_SET_EX_BLOCK :: struct #raw_union {
+		Flags: ULONG_PTR,
+		using DUMMYNAME : bit_field uintptr {
+			Valid:           ULONG_PTR | 1,
+			ShareCount:      ULONG_PTR | 3,
+			Win32Protection: ULONG_PTR | 11,
+			Shared:          ULONG_PTR | 1,
+			Node:            ULONG_PTR | 6,
+			Locked:          ULONG_PTR | 1,
+			LargePage:       ULONG_PTR | 1,
+			Reserved:        ULONG_PTR | 7,
+			Bad:             ULONG_PTR | 1,
+		},
+		Invalid: bit_field uintptr {
+			Valid:     ULONG_PTR | 1,
+			Reserved0: ULONG_PTR | 14,
+			Shared:    ULONG_PTR | 1,
+			Reserved1: ULONG_PTR | 15,
+			Bad:       ULONG_PTR | 1,
+		},
+	}
+}
+
+PPSAPI_WORKING_SET_BLOCK :: ^PSAPI_WORKING_SET_BLOCK
+PPSAPI_WORKING_SET_EX_BLOCK :: ^PSAPI_WORKING_SET_EX_BLOCK
+
+PSAPI_WORKING_SET_INFORMATION :: struct{
+	NumberOfEntries: ULONG_PTR,
+	WorkingSetInfo:  [1]PSAPI_WORKING_SET_BLOCK,
+} 
+
+PPSAPI_WORKING_SET_INFORMATION :: ^PSAPI_WORKING_SET_INFORMATION
+
+
+PSAPI_WORKING_SET_EX_INFORMATION :: struct {
+	VirtualAddress:    PVOID,
+	VirtualAttributes: PSAPI_WORKING_SET_EX_BLOCK,
+} 
+PPSAPI_WORKING_SET_EX_INFORMATION :: ^PSAPI_WORKING_SET_EX_INFORMATION
+
+
+PSAPI_WS_WATCH_INFORMATION :: struct {
+	FaultingPc: LPVOID,
+	FaultingVa: LPVOID,
+}
+PPSAPI_WS_WATCH_INFORMATION :: ^PSAPI_WS_WATCH_INFORMATION
+
+PSAPI_WS_WATCH_INFORMATION_EX :: struct {
+	BasicInfo:        PSAPI_WS_WATCH_INFORMATION,
+	FaultingThreadId: ULONG_PTR,
+	Flags:            ULONG_PTR,    // Reserved
+} 
+PPSAPI_WS_WATCH_INFORMATION_EX :: ^PSAPI_WS_WATCH_INFORMATION_EX
+
+
+PROCESS_MEMORY_COUNTERS :: struct {
+	cb:                         DWORD,
+	PageFaultCount:             DWORD,
+	PeakWorkingSetSize:         SIZE_T,
+	WorkingSetSize:             SIZE_T,
+	QuotaPeakPagedPoolUsage:    SIZE_T,
+	QuotaPagedPoolUsage:        SIZE_T,
+	QuotaPeakNonPagedPoolUsage: SIZE_T,
+	QuotaNonPagedPoolUsage:     SIZE_T,
+	PagefileUsage:              SIZE_T,
+	PeakPagefileUsage:          SIZE_T,
+}
+
+PROCESS_MEMORY_COUNTERS_EX :: struct {
+	using counter: PROCESS_MEMORY_COUNTERS,
+	PrivateUsage:  SIZE_T,
+}
+
+PROCESS_MEMORY_COUNTERS_EX2 :: struct {
+	using counter_ex:      PROCESS_MEMORY_COUNTERS_EX,
+	PrivateWorkingSetSize: SIZE_T ,
+	SharedCommitUsage:     ULONG64,
+}
+
+PPROCESS_MEMORY_COUNTERS :: ^PROCESS_MEMORY_COUNTERS
+
+PERFORMANCE_INFORMATION :: struct {
+	cb:                DWORD,
+	CommitTotal:       SIZE_T,
+	CommitLimit:       SIZE_T,
+	CommitPeak:        SIZE_T,
+	PhysicalTotal:     SIZE_T,
+	PhysicalAvailable: SIZE_T,
+	SystemCache:       SIZE_T,
+	KernelTotal:       SIZE_T,
+	KernelPaged:       SIZE_T,
+	KernelNonpaged:    SIZE_T,
+	PageSize:          SIZE_T,
+	HandleCount:       DWORD,
+	ProcessCount:      DWORD,
+	ThreadCount:       DWORD,
+} 
+PPERFORMANCE_INFORMATION :: ^PERFORMANCE_INFORMATION
+
+ENUM_PAGE_FILE_INFORMATION :: struct {
+	cb:         DWORD,
+	Reserved:   DWORD,
+	TotalSize:  SIZE_T,
+	TotalInUse: SIZE_T,
+	PeakUsage:  SIZE_T,
+} 
+PENUM_PAGE_FILE_INFORMATION :: ^ENUM_PAGE_FILE_INFORMATION
+
+Enum_Page_File_Callback :: #type proc "system" (pContext: LPVOID, pPageFileInfo: PENUM_PAGE_FILE_INFORMATION, lpFilename: LPCWSTR) -> BOOL