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Code signing an .app file using signtool.

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Posted on by Jinesh K

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Hi members,

i am trying to sign an .app file for appsource. but im getting an error that says "this file format cannot be signed".
I have done this before successfully on my pc.

1. I have business central Installed on my system.(I dont use it)
2. it is a sectigo certificate HSM
3. the command i am using is : signtool sign /sha1 12345678932156987 /tr http://timestamp.sectigo.com /td sha256 /fd sha256 /n "My Company" "C:\path\to\fileToSign.exe"
4. the command was given by the sectigo team, but im pretty sure this didn't work last time too. I had to make some change in this, but I don't remember what are the changes I made.

Could anyone guide me what im doing wrong here?

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KP - Solution Archi... 658 on at

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Hi

You can refer to our blog for the step by step guide to signing in the app file.

https://madhda.com/it-blog/secure-code-signing-with-azure-key-vault-a-step-by-step-guide/

Thanks,

KP

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Sohail Ahmed 11,175 Super User 2026 Season 1 on at

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This might be helpful for your problem

https://learn.microsoft.com/en-us/windows/msix/package/sign-app-package-using-signtool

mark this as verified answer if it helps you

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YUN ZHU 100,552 Super User 2026 Season 1 on at

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Who did you buy your certificate from? I suggest you contact them to resolve the issue.

PS: Signtool unable to load signing certificate - Microsoft Q&A

Hope this helps.

Thanks.

ZHU

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Khushbu Rajvi. 22,350 Super User 2026 Season 1 on at

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Hope this helps: https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-sign-extension

https://learn.microsoft.com/en-us/windows/win32/appxpkg/how-to-sign-a-package-using-signtool

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