simple question about grfs

[IsabelaFernandez]

I downloaded and came data.grf and rdata.grf but I realized that I removed rdata.grf from my DATA.INI. I would like to know the difference between 
the two and whether it is necessary to run a private server.
And the order, for example:
0=mygrf.grf
1=data.grf
2=rdata.grf
or rdata.grf before the data.grf?

[Mael]

5 hours ago, IsabelaFernandez said:

I downloaded and came data.grf and rdata.grf but I realized that I removed rdata.grf from my DATA.INI. I would like to know the difference between 
the two and whether it is necessary to run a private server.
And the order, for example:
0=mygrf.grf
1=data.grf
2=rdata.grf
or rdata.grf before the data.grf?

[Data]
1=customdata-01.grf
2=customdata-02.grf
3=rdata.grf
4=data.grf

Edited June 11, 2020 by Mael