/usr/share/doc/libgtkglextmm-x11-1.2-doc/window_8h__incl.map is in libgtkglextmm-x11-1.2-doc 1.2.0-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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rect $gdkglext_2gdkmm_2gl_2defs_8h.html 570,160 690,184
rect $config_8h.html 392,160 522,184
rect $drawable_8h.html 196,109 342,133
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