fixes #12186

lib/pure/memfiles.nim

@@ -60,7 +60,7 @@ proc mapMem*(m: var MemFile, mode: FileMode = fmRead,
       if readonly: FILE_MAP_READ else: FILE_MAP_READ or FILE_MAP_WRITE,
       int32(offset shr 32),
       int32(offset and 0xffffffff),
-      if mappedSize == -1: 0 else: mappedSize,
+      WinSizeT(if mappedSize == -1: 0 else: mappedSize),
       nil)
     if result == nil:
       raiseOSError(osLastError())

lib/windows/winlean.nim

@@ -745,9 +745,16 @@ proc setFilePointer*(hFile: Handle, lDistanceToMove: LONG,
 proc getFileSize*(hFile: Handle, lpFileSizeHigh: ptr DWORD): DWORD{.stdcall,
     dynlib: "kernel32", importc: "GetFileSize".}
 
+when defined(cpu32):
+  type
+    WinSizeT* = uint32
+else:
+  type
+    WinSizeT* = uint64
+
 proc mapViewOfFileEx*(hFileMappingObject: Handle, dwDesiredAccess: DWORD,
                       dwFileOffsetHigh, dwFileOffsetLow: DWORD,
-                      dwNumberOfBytesToMap: DWORD,
+                      dwNumberOfBytesToMap: WinSizeT,
                       lpBaseAddress: pointer): pointer{.
     stdcall, dynlib: "kernel32", importc: "MapViewOfFileEx".}