/usr/share/texstudio/template_Letter.json is in texstudio-doc 2.10.8+debian-1.
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 | {
"Name" : "Letter",
"Description" : "Default LaTeX class for letters.",
"Author" : "TXS built-in",
"Date" : "17.8.2009",
"Version" : "1.0",
"License" : "Public Domain"
}
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