The designer icon never appears in the Solution Explorer tab (the path spaces issue)

[Yaroslav-Kuznetsov]

Environment

Visual Studio 17.13.0

.NET version

.NET 9

Did this work in a previous version of Visual Studio and/or previous .NET release?

Yes

Issue description

Starting with the latest VS build it became impossible to show the visual designer, either by double clicking the file or using the context menu command. Note that the corresponding file association is still generated:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <ItemGroup>
        <Compile Update="Form1.cs">
            <SubType>Form</SubType>
        </Compile>
    </ItemGroup>
</Project>

Steps to reproduce

Create a brand new WinForms (.NET) project on any path that contains spaces in it. E.g.,
C:\Users\Admin\source\repos\New Folder (4)\WinFormsApp1\WinFormsApp1

Diagnostics

[John-Qiao]

A similar issue filed in design time: https://github.com/microsoft/winforms-designer/issues/6205

[Tanya-Solyanik]

@Yaroslav-Kuznetsov - is this a duplicate of your issue - https://developercommunity.visualstudio.com/t/WinForms-designer-refuses-to-load-with-S/10754815, if it is then please upvote

[Shyam-Gupta]

@Yaroslav-Kuznetsov This is a known issue and is under investigation. Here is a possible workaround for time being. Thanks.