/usr/share/icons/Foxtrot/index.theme is in gnome-themes-extras 2.22.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Name=Foxtrot
Name[ca]=Foxtrot
Name[en_GB]=Foxtrot
Name[eu]=Foxtrot
Name[sv]=Foxtrot
Comment=A tangonized theme with Bluecurve colors
Comment[ca]=Un tema basat amb el Tango amb colors Bluecurve
Comment[en_GB]=A Tangoised theme with Bluecurve colours
Comment[eu]=Tango-n oinarritutako gaia Kurba-urdin koloreekin
Comment[sv]=Ett tangofierat tema med Bluecurve-färger
Inherits=gnome
Example=x-directory-normal
# Directory list
Directories=16x16/actions,16x16/mimetypes,16x16/places,16x16/status,22x22/actions,22x22/mimetypes,22x22/places,22x22/status,24x24/actions,24x24/mimetypes,24x24/places,24x24/status,scalable/actions,scalable/mimetypes,scalable/places,scalable/status,scalable/categories
[16x16/actions]
Size=16
Context=Actions
Type=Fixed
[16x16/mimetypes]
Size=16
Context=MimeTypes
Type=Fixed
[16x16/places]
Size=16
Context=MimeTypes
Type=Fixed
[16x16/status]
Size=16
Context=Status
Type=Fixed
[22x22/actions]
Size=22
Context=Applications
Type=Fixed
[22x22/mimetypes]
Size=22
Context=MimeTypes
Type=Fixed
[22x22/places]
Size=22
Context=MimeTypes
Type=Fixed
[22x22/status]
Size=22
Context=Status
Type=Fixed
[24x24/actions]
Size=24
Context=Actions
Type=Fixed
[24x24/mimetypes]
Size=24
Context=MimeTypes
Type=Fixed
[24x24/places]
Size=24
Context=MimeTypes
Type=Fixed
[24x24/status]
Size=24
Context=Status
Type=Fixed
[scalable/actions]
Size=48
Context=Actions
Type=Scalable
MinSize=32
MaxSize=2048
[scalable/mimetypes]
Size=48
Context=MimeTypes
Type=Scalable
MinSize=32
MaxSize=2048
[scalable/places]
Size=48
Context=Places
Type=Scalable
MinSize=32
MaxSize=256
[scalable/apps]
Size=48
Context=Applications
Type=Scalable
MinSize=32
MaxSize=256
[scalable/status]
Size=48
Context=Status
Type=Scalable
MinSize=32
MaxSize=256
[scalable/categories]
Size=48
Context=Categories
Type=Scalable
MinSize=32
MaxSize=256
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