Backslashes are tricky.

Lukasa · Lukasa · commit a27b8fe6bb05 · 2016-05-04T14:27:21.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -146,7 +146,7 @@ install:
 build_script: appveyor/build.bat
 
 after_test:
-  - "appveyor\build.cmd %PYTHON%\\python.exe setup.py bdist_wheel"
+  - "appveyor\\build.cmd %PYTHON%\\python.exe setup.py bdist_wheel"
 
 artifacts:
   - path: dist\*
