Eliminate VC compiler warning.

apps/apps.c

diff --git a/apps/apps.c b/apps/apps.c
index 5a05604..fc15a74 100644
--- a/apps/apps.c
+++ b/apps/apps.c
@@ -2418,7 +2418,7 @@
 		tmstop.u.LowPart   = now.dwLowDateTime;
 		tmstop.u.HighPart  = now.dwHighDateTime;
 
-		ret = (tmstop.QuadPart - tmstart.QuadPart)*1e-7;
+		ret = (__int64)(tmstop.QuadPart - tmstart.QuadPart)*1e-7;
 		}
 
 	return (ret);