Command line of Azure Virtual Desktop application has length limits?

Question

Hi,

I've been experimenting with Azure Virtual Desktop, with RemoteApp application group and application with required command line. I noticed, that if total length of command line arguments exceeds 256 characters, then my application is not even reached to be executed. I attached screenshot which shows which property of AVD application wizard I mean:

Here is the only related documentation I've found about details of AVD applications:

• https://learn.microsoft.com/en-us/rest/api/desktopvirtualization/applications/create-or-update
• https://learn.microsoft.com/en-us/powershell/module/az.desktopvirtualization/new-azwvdapplication
• https://learn.microsoft.com/en-us/azure/virtual-desktop/publish-applications-stream-remoteapp

and none of these mention any length limit, or any other limits, of the command line arguments.

Is this length limit by design and 'just' not documented or is it an unexpected bug?

Answer 1

Hello Mateusz Łoskot

Welcome to Microsoft Q&A Platform, thanks for posting your query here.

Adding to previous response from Dillion, I checked with internal team and can confirm that this limitation is by design to ensure the compatibility in Windows.

Ref: https://learn.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation?tabs=registry

Hope this helps.

Answer 2

Hi Mateusz,

In accordance to documentation, I would suggest you bring this up with AVD Tech Community:

https://techcommunity.microsoft.com/t5/azure-virtual-desktop/bd-p/AzureVirtualDesktopForum

It does seem like it is an undocumented limitation, but it is interested that you would require anything that long with switches.

Documentation on reporting issues, giving feedback, or getting support can be found at:

Troubleshooting overview, feedback, and support for Azure Virtual Desktop

https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/virtual-desktop/troubleshoot-set-up-overview.md

If this is helpful please accept answer.