
What this is trying to tell you, albeit not doing a very good job of that, is that it can't read anything from StarCraft's MPQ file. It's not a particularly inviting message, I know. First, if you run RetroGRP and you get a message saying "Errrrrror" then just click OK and ignore it. RetroGRP is very easy to use and works very well at decompiling and compiling GRPs, but it has a few things to look out for when you use it. You will also need to setup WinMPQ to use a listfile, UED77's MPQ Listfile is a good enough choice of listfile for the purpose of GRP editing. Make sure you got both of these programs to get the examples in this tutorial working. This tutorial will give you instructions on how to use RetroGRP with WinMPQ and your graphics package to perform those three activities. Editing is the part where you create or edit frames for your GRP file. Decompiling a GRP is converting a GRP into all of its source images, and compiling is doing the reverse, that is going from a number of source images and converting them into a GRP. There are so many ways to edit GRP files, but they all come down to three main activities. It all depends on what the GRP file represents. The Zerg Lurker has 595 frames, while Psionic Storm only has 14 frames. Each GRP file will contain a different number of frames. For example, the GRP file of the Terran Medic has 230 frames, all of these stored in the same GRP file. With your knowledge of patching the MPQ, the help of a GRP converter program and also a little bit of wisdom about GRP files, you will be able to change a lot of the graphics in StarCraft.Īs the name suggests, GRP is short for "Group." It's called this because GRP files can contain many frames. GRP files are StarCraft's format for storing the frames for the graphics of all the units, weapons, spells, doodads, wireframes and several other things. SMK files are used to store the cinematics and portrait animations. There are PCX files to store menu backgrounds and race control panel graphics. In StarCraft, graphics are stored in one of many ways.


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