diff --git a/src/Common/Dlgcode.c b/src/Common/Dlgcode.c
index 3f3dec56..94121ec7 100644
--- a/src/Common/Dlgcode.c
+++ b/src/Common/Dlgcode.c
@@ -523,14 +523,18 @@ char *LoadFile (const wchar_t *fileName, DWORD *size)
 {
 	char *buf;
 	DWORD fileSize = INVALID_FILE_SIZE;
+	DWORD fileSizeHigh = 0;
 	HANDLE h = CreateFile (fileName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
 	*size = 0;
 	if (h == INVALID_HANDLE_VALUE)
 		return NULL;
 
-	if ((fileSize = GetFileSize (h, NULL)) == INVALID_FILE_SIZE)
+	if ((fileSize = GetFileSize (h, &fileSizeHigh)) == INVALID_FILE_SIZE || fileSizeHigh != 0)
 	{
 		CloseHandle (h);
+		// Refuse a file of 4 GiB or more, which would otherwise be truncated to its size modulo 4 GiB
+		if (fileSizeHigh != 0)
+			SetLastError (ERROR_FILE_TOO_LARGE);
 		return NULL;
 	}