Download the latest wasi-sdk from https://github.com/WebAssembly/wasi-sdk/releases, extract it somewhere, create environment variable with WASI_SDK_PATH name and store the path of extracted wasi-sdk. Copy the wasi.cmd & wasi.ps1 files from given gist and paste it somewhere globally accessible. Now you can can access the wasi-sdk's executables vi…

wasi.cmd

@echo off
setlocal
set wasi_bin_path=%WASI_SDK_PATH%\bin
set wasi_self=%~n0
set wasi_cmd=%1
if "%wasi_cmd%" == "" (
  echo Usage: %wasi_self% executable [arguments]
  exit /b 1
)
if not exist "%wasi_bin_path%\%wasi_cmd%.exe" (
  echo Error: %wasi_cmd% is not a valid executable in %wasi_bin_path%
  exit /b 2
)
shift
%wasi_bin_path%\%*

wasi.ps1

#!/usr/bin/env pwsh
$wasi_bin_path = "$env:WASI_SDK_PATH\bin"
$wasi_self = $MyInvocation.MyCommand.Name
$wasi_cmd = $args[0]
if ($args.Length -eq 0) {
  Write-Host "Usage: $wasi_self executable [arguments]"
  exit 1
}
if (-not (Test-Path "$wasi_bin_path\$wasi_cmd.exe")) {
  Write-Host "Error: $wasi_cmd is not a valid executable in $wasi_bin_path"
  exit 2
}
$args = $args[1..($args.Length - 1)]
& "$wasi_bin_path\$wasi_cmd.exe" $args