If anyone is looking to remove death animations here is the code
var path = @"C:\RO\data\sprite\test";
foreach (var actFile in Directory.GetFiles(path, "*.act")) {
var sprFile = actFile.ReplaceExtension(".spr");
var act2 = new Act(actFile, sprFile);
for (int aid = 32; aid < act2.Actions.Count; aid++) {
for (int fid = act2.Actions[aid].Frames.Count - 1; fid >= 1; fid--) {
act2[aid].Frames.RemoveAt(fid);
}
}
act2.SaveWithSprite(actFile, sprFile);
}