Fixes #315 py throws error 'Can't find default python'

python.json

@@ -19,6 +19,25 @@
 		[ "python.exe", "python3" ]
 	],
 	"env_add_path": [ "scripts" ],
-	"post_install": "python -m ensurepip; cp (gcm pip3).path \"$(split-path (gcm pip3).path)/pip.exe\"",
+	"post_install": "
+		python -m ensurepip; cp (gcm pip3).path \"$(split-path (gcm pip3).path)/pip.exe\"
+
+		$create_reg = {
+			param($path, $value)
+
+			$reg_base = \"Registry::HKEY_CURRENT_USER\\Software\"
+
+			new-item -path \"$reg_base\\$path\" -force | out-null
+			new-itemproperty -path \"$reg_base\\$path\" `
+				-name \"(Default)\" -value \"$value\" -force | out-null
+		}
+
+		$create_reg.Invoke(\"Classes\\Python.File\\shell\\open\\command\", ` 
+			\"`\"$dir\\py.exe`\" `\"%1`\" %*\")
+		$create_reg.Invoke(\"Classes\\.py\", \"Python.File\")
+		$create_reg.Invoke(\"Python\\PythonCore\\3.4\\InstallPath\", `
+			\"$dir\")
+	",
 	"checkver": "<p>Latest: <a href=\".*\">Python ([0-9\\.]+)</a> - <a.*>.*</a></p>"
 }
+

python27.json

@@ -18,6 +18,13 @@
 		[ "python.exe", "python2" ]
 	],
 	"env_add_path": [ "scripts" ],
-	"post_install": "python2 -m ensurepip",
+	"post_install": "
+		python2 -m ensurepip
+
+		$reg_path = \"Registry::HKEY_CURRENT_USER\\Software\\Python\\PythonCore\\2.7\\InstallPath\"
+		new-item -path $reg_path -force | out-null
+		new-itemproperty -path $reg_path `
+			-name \"(Default)\" -value \"$dir\" -force | out-null
+	",
 	"checkver": "<p>Latest: <a.*>.*</a> - <a href=\".*\">Python ([0-9\\.]+)</a></p>"
 }