Change code in the *.grf

[vPhoeniXv]

How I can change code in the *.grf (file NewGRF)?

[Sylf]

If you have the source code for it (inherited the code from someone, found some rogue code, or get it from its official source repositories such as github or this), then you just have to find a way to compile the code. How to compile it depends on how it was written - nfo format, m4nfo, nml etc.

If you only have access to the grf file itself, then things are much harder.
You can use GRF Codec to decode it. It will give you the source code in nfo format. It is not an easy code to read or edit, but it is possible to hack your way through it.

Further discussion is more appropriate in this forum.

[vPhoeniXv]

Thanks

[Alberth]

If you make changes, please also change the GRF-ID and the name, so your changed version is really different from the "real" one. It avoids a lot of potential problems.

Also, most grfs are licensed with the requirement that you must publish the changes if you publish the newgrf (so others can build on your work in the future, like you can build on previous work). Please keep that in mind when giving your changed newgrf to someone else.

[Transportman]

If you make changes, please also change the GRF-ID and the name, so your changed version is really different from the "real" one. It avoids a lot of potential problems.

Also, most grfs are licensed with the requirement that you must publish the changes if you publish the newgrf (so others can build on your work in the future, like you can build on previous work). Please keep that in mind when giving your changed newgrf to someone else.

If it has such a license, the source is most of the times also available.

[Alberth]

If you make changes, please also change the GRF-ID and the name, so your changed version is really different from the "real" one. It avoids a lot of potential problems.

Also, most grfs are licensed with the requirement that you must publish the changes if you publish the newgrf (so others can build on your work in the future, like you can build on previous work). Please keep that in mind when giving your changed newgrf to someone else.

If it has such a license, the source is most of the times also available.

I was talking about the modified grf. Eg GPL license requires that you publish your changes when you publish (or give away) your modified newgrf.