You may know that you can sign a PDF with DynaPDF cross platform in Xojo (and FileMaker) with a certificate file, usually a PKCS#12 file.
But for Windows, our Xojo plugin offers an alternative way by using the local certificate storage. So your user can have the private key with certificate installed on the Windows machine and sign without knowing the password for the certificate!
On the right, you see the dialog from Windows to pick a certificate in German.
If you have no certificate, you get an error message. If you have one, you can confirm to use it and if you have several certificates, you can pick one. The dialog is localized for the user.
PS: If needed, we could add that quite soon for FileMaker, too.