diff --git a/Mkfiles/vc10/genperf/run.bat b/Mkfiles/vc10/genperf/run.bat
index 5827138..775f1d0 100644
--- a/Mkfiles/vc10/genperf/run.bat
+++ b/Mkfiles/vc10/genperf/run.bat
@@ -1,13 +1,24 @@
 cd ..\..\..
 @echo off
-for /f "usebackq tokens=1*" %%f in (`reg query HKCR\Python.File\shell\open\command`) do (set _my_=%%f %%g)
-goto next%errorlevel%
 
-:next1
+for /f "usebackq tokens=1*" %%f in (`reg query HKCR\Applications\python.exe\shell\open\command`) do (set _my_=%%f %%g)
+goto try1%errorlevel%
+
+:try10
+goto ok
+
+:try11
+for /f "usebackq tokens=1*" %%f in (`reg query HKCR\Python.File\shell\open\command`) do (set _my_=%%f %%g)
+goto try2%errorlevel%
+
+:try20:
+goto ok
+
+:try21:
 echo Building without Python ...
 goto therest
 
-:next0
+:ok
 echo Building with Python ...
 set _res_=%_my_:*REG_SZ=%
 set _end_=%_res_:*exe"=%