# Signing .jar files, provide list of working files
**URL:** https://www.finalbuilder.com/forums/t/signing-jar-files-provide-list-of-working-files/7664
**Category:** Feature Requests
**Created:** [June 14, 2025, 7:12am UTC](https://www.finalbuilder.com/forums/t/signing-jar-files-provide-list-of-working-files/7664 "2025-06-14T07:12:39Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@m.siedenburg](https://www.finalbuilder.com/forums/u/m.siedenburg)
#### Post date: [June 14, 2025, 7:12am UTC](https://www.finalbuilder.com/forums/t/signing-jar-files-provide-list-of-working-files/7664/1 "2025-06-14T07:12:39Z")
Hello, first of all, thanks for the great and easy to use software.
Most of the time it’s working great, but we found a problem with .jar files.
If we want to sign .jar we only get the error “The subject form is unknown”, because of that we think that .jar right now isn’t supported, would be great if it could be signed in the future.
It would also be great if you could provide a list of working filetypes, or did I miss it?
---
### Author:  [@Vincent](https://www.finalbuilder.com/forums/u/Vincent)
#### Post date: [June 14, 2025, 7:15am UTC](https://www.finalbuilder.com/forums/t/signing-jar-files-provide-list-of-working-files/7664/2 "2025-06-14T07:15:58Z")
Hi Mirco
Signotaur does not support .jar files. We use the same windows apis as signtool so it’s currently limited to what windows can sign (natively) :
| File Categories Supported | Files Extension Examples |
| --- | --- |
| APPX and MSIX Packages | .appx, .appxbundle, .msix, .msixbundle |
| Cabinet | .cab |
| Catalog | .cat |
| Installation/Deployment | .deploy |
| Microsoft Installers | .msi |
| Portable Executables (PE) | .dll, .efi, .exe, .sys,.scr |
| Scripts | .js, .ps1, .vbs, .wsf |