/usr/share/applications/sift-py2.desktop is in python-guiqwt 3.0.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Type=Application
Name=Sift
GenericName=Sift
Comment=Signal and Image Filtering Tool (demo software based on guidata and guiqwt)
TryExec=sift-py2
Exec=sift-py2
MimeType=application/x-foo;
Categories=Development;Science;Physics;
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