Hi @Philipp Lagrange ,
Basically if you start a published application in the WVD environment it's a VM you are connecting and logging in. But you don't see the full desktop. Instead only the application window is displayed.
To answer your question:
No it's not possible to avoid the execution of the logon script.
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten