/usr/share/doc/claws-mail/tools/kdeservicemenu/claws-mail-attach-files.desktop.kde4template is in claws-mail-tools 3.8.0-1ubuntu1.
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 13 14 | [Desktop Entry]
Type=Service
Actions=AttachFiles;
Comment=kde service menu for attaching files to Claws Mail
Encoding=UTF8
Name=Claws Mail attach files
ServiceTypes=KonqPopupMenu/Plugin,all/allfiles
X-KDE-Priority=TopLevel
X-KDE-Submenu=Claws Mail
[Desktop Action AttachFiles]
Exec=SCRIPT_PATH %F
Icon=claws-mail
Name=Attach File(s)
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