Those files are generated in ArcGIS. Are auxiliary files for georeferencing and visualization, aren't part of GTiff as .shx or .dbf are in a shapefile.

• .tfw is ESRI World file
• .ovr are piramid layers
• .xml is schema look and histogram
• .cpg and .dbf is for TIFF interpretation.

You can add .tfw using GDAL through raster package:

library(raster)

r <- raster()
values(r) <- sample(x = 1:10,size = ncell(r),replace = T)

writeRaster(r,'test.tif',options=c('TFW=YES'))

Check other options from GDAL GeoTIFF File Format to customize your export.

Those files are generated in ArcGIS. Are auxiliary files for georeferencing and visualization, aren't part of GTiff as .shx or .dbf are in a shapefile.

• .tfw is ESRI World file
• .ovr are piramid layers
• .xml is schema look and histogram
• .cpg is for TIFF interpretation.
• .dbf is for raster attribute table (thanks to @radouxju)

You can add .tfw using GDAL through raster package:

library(raster)

r <- raster()
values(r) <- sample(x = 1:10,size = ncell(r),replace = T)

writeRaster(r,'test.tif',options=c('TFW=YES'))

Check other options from GDAL GeoTIFF File Format to customize your export.