Rider 2019.3 doesn't open all WinForms in designer


I'm using Rider 2019.3 on Windows 10. I have a dotNet Framework 4.7.1 Class library project using System.Windows.Forms.

When switching to Rider i have encountered the problem, that i can't open all of my WinForms in the integrated designer. I can't find information about under which circumstances the designer recognizes WinForms. Both files I'm comparing right now, of which one is working fine, while the other is not, inherit from System.Windows.Forms.Form.


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Hi Max-Niklas,

thank you for contacting us. 

Could you please reproduce the error and attach Rider logs as described in this article? Could you please also attach a screenshot of the error? 

To attach files, you can create a new support request via `Help | Contact support` or `Help | Submit a bug`.
Thank you in advance. 


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