/usr/lib/R/site-library/Rcmdr/INDEX is in r-cran-rcmdr 2.2-3-1.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 | AuxiliarySoftware       Install R Commander Auxiliary Software
CFA                     Rcmdr Confirmatory Factor Analysis Dialog
Commander               R Commander
Commander-es            R Commander
Compute                 Rcmdr Compute Dialog
Confint                 Confidence Intervals for Model Coefficients
Plugins                 R Commander Plug-in Packages
Rcmdr-internal          'tcltk' Functions Re-exported by the 'Rcmdr'
                        Package.
Rcmdr-package           R Commander
Rcmdr.Utilities         Rcmdr Utility Functions
RcmdrPager              Pager for Text Files
RecodeDialog            Rcmdr Recode Dialog
Scatter3DDialog         Rcmdr 3D Scatterplot Dialog
ScriptEditor            R Commander Script Editor
editDataset             R Commander Dataset Editor
generalizedLinearModel
                        Rcmdr Generalized Linear Model Dialog
hierarchicalCluster     Rcmdr Hierarchical Clustering Dialog
linearModel             Rcmdr Linear Model Dialog
saveOptions             Save R Commander Options in an R Profile File
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