/usr/share/services/kst/ is in kst-data 2.0.3-1.3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/services/kst/kstdata_ascii.desktop
/usr/share/services/kst/kstdata_dirfilesource.desktop
/usr/share/services/kst/kstdata_fitsimage.desktop
/usr/share/services/kst/kstdata_netcdf.desktop
/usr/share/services/kst/kstdata_qimagesource.desktop
/usr/share/services/kst/kstdata_sampledatasource.desktop
/usr/share/services/kst/kstplugin_akima.desktop
/usr/share/services/kst/kstplugin_akimaperiodic.desktop
/usr/share/services/kst/kstplugin_autocorrelation.desktop
/usr/share/services/kst/kstplugin_bin.desktop
/usr/share/services/kst/kstplugin_chop.desktop
/usr/share/services/kst/kstplugin_convolve.desktop
/usr/share/services/kst/kstplugin_crosscorrelation.desktop
/usr/share/services/kst/kstplugin_crossspectrum.desktop
/usr/share/services/kst/kstplugin_csplineperiodic.desktop
/usr/share/services/kst/kstplugin_cumulativesum.desktop
/usr/share/services/kst/kstplugin_deconvolve.desktop
/usr/share/services/kst/kstplugin_differentiation.desktop
/usr/share/services/kst/kstplugin_effectivebandwidth.desktop
/usr/share/services/kst/kstplugin_filter_butterworth_bandpass.desktop
/usr/share/services/kst/kstplugin_filter_butterworth_bandstop.desktop
/usr/share/services/kst/kstplugin_filter_butterworth_highpass.desktop
/usr/share/services/kst/kstplugin_filter_butterworth_lowpass.desktop
/usr/share/services/kst/kstplugin_filter_despike.desktop
/usr/share/services/kst/kstplugin_fits_exponential_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_exponential_weighted.desktop
/usr/share/services/kst/kstplugin_fits_gaussian_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_gaussian_weighted.desktop
/usr/share/services/kst/kstplugin_fits_gradient_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_gradient_weighted.desktop
/usr/share/services/kst/kstplugin_fits_kneefrequency.desktop
/usr/share/services/kst/kstplugin_fits_linear_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_linear_weighted.desktop
/usr/share/services/kst/kstplugin_fits_lorentzian_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_lorentzian_weighted.desktop
/usr/share/services/kst/kstplugin_fits_polynomial_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_polynomial_weighted.desktop
/usr/share/services/kst/kstplugin_fits_sinusoid_unweighted.desktop
/usr/share/services/kst/kstplugin_fits_sinusoid_weighted.desktop
/usr/share/services/kst/kstplugin_genericfilter.desktop
/usr/share/services/kst/kstplugin_linear.desktop
/usr/share/services/kst/kstplugin_linefit.desktop
/usr/share/services/kst/kstplugin_lockin.desktop
/usr/share/services/kst/kstplugin_noiseaddition.desktop
/usr/share/services/kst/kstplugin_periodogram.desktop
/usr/share/services/kst/kstplugin_phase.desktop
/usr/share/services/kst/kstplugin_polynomial.desktop
/usr/share/services/kst/kstplugin_shift.desktop
/usr/share/services/kst/kstplugin_statistics.desktop
/usr/share/services/kst/kstplugin_syncbin.desktop