diff --git a/autoload/ale/python.vim b/autoload/ale/python.vim
index d788b779..4734ac44 100644
--- a/autoload/ale/python.vim
+++ b/autoload/ale/python.vim
@@ -77,7 +77,7 @@ endfunction
 " Run an executable check for Python scripts.
 " On Windows, 1 will be returned if the file is merely readable.
 function! ale#python#IsExecutable(path) abort
-    return has('win32') ? filereadable(a:path) : executable(a:path)
+    return executable(a:path)
 endfunction
 
 " Given a buffer number and a command name, find the path to the executable.
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/autopep8 b/test/command_callback/python_paths/with_virtualenv/env/Scripts/autopep8.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/autopep8
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/autopep8.exe
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/flake8 b/test/command_callback/python_paths/with_virtualenv/env/Scripts/flake8.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/flake8
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/flake8.exe
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/isort b/test/command_callback/python_paths/with_virtualenv/env/Scripts/isort.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/isort
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/isort.exe
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/mypy b/test/command_callback/python_paths/with_virtualenv/env/Scripts/mypy.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/mypy
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/mypy.exe
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/pylint b/test/command_callback/python_paths/with_virtualenv/env/Scripts/pylint.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/pylint
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/pylint.exe
diff --git a/test/command_callback/python_paths/with_virtualenv/env/Scripts/yapf b/test/command_callback/python_paths/with_virtualenv/env/Scripts/yapf.exe
similarity index 100%
rename from test/command_callback/python_paths/with_virtualenv/env/Scripts/yapf
rename to test/command_callback/python_paths/with_virtualenv/env/Scripts/yapf.exe