This is an inefficient format, so be warned: you are going to get a datafile.
The SoilGrids Africa GYGA_Results_1km Aggregated_over30cm Total available water - fine earth and coarse fragments data are available as a columnar table, i.e. as multiple columns of data, intended primarily to be read. However, if you have other intentions for this table, or simply do not like the default choices, you may want to choose from the columnar tables with options.