/usr/share/xfce4/helpers/sylpheed-claws.desktop is in libexo-helpers 0.10.2-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | [Desktop Entry]
Version=1.0
Icon=claws-mail
Type=X-XFCE-Helper
Name=Claws Mail
Name[lt]=Claws Mail
Name[ru]=Claws Mail
StartupNotify=true
X-XFCE-Binaries=claws-mail;sylpheed-claws-gtk2;sylpheed-claws
X-XFCE-Category=MailReader
X-XFCE-Commands=%B;
X-XFCE-CommandsWithParameter=/usr/lib/x86_64-linux-gnu/xfce4/exo-1/exo-compose-mail-1 sylpheed %B "mailto:%s";
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