What's the new edit to post the app?

Question

Windows Forms

It used to be different ...
How to make it for x86 was?

Now:

<?xml version="1.0" encoding="utf-8"?>
<!--
https://go.microsoft.com/fwlink/?LinkID=208121. 
-->
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <Configuration>Release</Configuration>
    <Platform>Any CPU</Platform>
    <PublishDir>C:\Users\Влад Мармелад\Desktop\MoyArbitr</PublishDir>
    <PublishProtocol>FileSystem</PublishProtocol>
  </PropertyGroup>
</Project>

Answer 1

You can google about ms .csproj Platform.
Well, or check the checkboxes in the project properties more carefully.