Process.run can't run batch files on windows without extensions

[lexaknyazev]

Dart VM version: 2.0.0-dev.6.0 (Thu Nov 02 09:04:29 2017) on "windows_x64"

With extension

import 'dart:io';

main(List<String> arguments) {
  print(Process.runSync('pub.bat', ['help']).stdout);
}

Pub is a package manager for Dart.
...

Without extension

import 'dart:io';

main(List<String> arguments) {
  print(Process.runSync('pub', ['help']).stdout);
}

Unhandled exception:
ProcessException: The system cannot find the file specified.

[liudonghua123]

I have the same issue, I want to build and run dart-pad/dart-services, Firstly I got vulcanize command not found issue, I changed to vulcanize.cmd then it worked, and during the running, I got ProcessException: The system cannot find the file specified. Command: D:\apps\Dart\dart-sdk\bin\dart2js, I need to find and change dart2js to dart2js.bat.

I think Process.run/Process.runSync should consider the PATHEXT environment. And run without executable extension.

[jibbers42]

This affects flutterfire_cli's update command as it currently fails on Windows with "ProcessException: The system cannot find the file specified."
invertase/flutterfire_cli#252