Program: 8910
Project: 8910
Buggy source:
/** 
 * Extract and copy DK II textures
 * @param dungeonKeeperFolder DK II main folder
 * @param destination Destination folder
 */
private void convertTextures(String dungeonKeeperFolder,String destination){
  if (!ConvertProcess.TEXTURES.isOutdated()) {
    return;
  }
  logger.log(Level.INFO,"String_Node_Str",destination);
  updateStatus(null,null,ConvertProcess.TEXTURES);
  EngineTexturesFile etFile=getEngineTexturesFile(dungeonKeeperFolder);
  Pattern pattern=Pattern.compile("String_Node_Str");
  WadFile frontEnd=new WadFile(new File(dungeonKeeperFolder.concat("String_Node_Str").concat(File.separator).concat("String_Node_Str")));
  WadFile engineTextures=new WadFile(new File(dungeonKeeperFolder.concat("String_Node_Str").concat(File.separator).concat("String_Node_Str")));
  int i=0;
  int total=etFile.getFileCount() + frontEnd.getWadFileEntries().size() + engineTextures.getWadFileEntries().size();
  for (  String textureFile : etFile) {
    updateStatus(i,total,ConvertProcess.TEXTURES);
    i++;
    Matcher matcher=pattern.matcher(textureFile);
    boolean found=matcher.find();
    if (found && Integer.parseInt(matcher.group("String_Node_Str")) == 0) {
      File f=etFile.extractFileData(textureFile,destination,OVERWRITE_DATA);
      File newFile=new File(f.toString().replaceFirst("String_Node_Str" + matcher.group("String_Node_Str"),"String_Node_Str"));
      if (OVERWRITE_DATA && newFile.exists()) {
        newFile.delete();
      }
 else       if (!OVERWRITE_DATA && newFile.exists()) {
        logger.log(Level.INFO,"String_Node_Str",newFile);
        f.delete();
        continue;
      }
      f.renameTo(newFile);
    }
 else     if (!found) {
      etFile.extractFileData(textureFile,destination,OVERWRITE_DATA);
    }
  }
  extractTextureContainer(i,total,frontEnd,destination);
  extractTextureContainer(i,total,engineTextures,destination);
}

Fixed version (ground truth):
/** 
 * Extract and copy DK II textures
 * @param dungeonKeeperFolder DK II main folder
 * @param destination Destination folder
 */
private void convertTextures(String dungeonKeeperFolder,String destination){
  if (!ConvertProcess.TEXTURES.isOutdated()) {
    return;
  }
  logger.log(Level.INFO,"String_Node_Str",destination);
  updateStatus(null,null,ConvertProcess.TEXTURES);
  EngineTexturesFile etFile=getEngineTexturesFile(dungeonKeeperFolder);
  Pattern pattern=Pattern.compile("String_Node_Str");
  WadFile frontEnd;
  WadFile engineTextures;
  try {
    frontEnd=new WadFile(new File(Utils.getRealFileName(dungeonKeeperFolder,"String_Node_Str".concat(File.separator).concat("String_Node_Str"))));
    engineTextures=new WadFile(new File(Utils.getRealFileName(dungeonKeeperFolder,"String_Node_Str".concat(File.separator).concat("String_Node_Str"))));
  }
 catch (  IOException e) {
    throw new RuntimeException("String_Node_Str",e);
  }
  int i=0;
  int total=etFile.getFileCount() + frontEnd.getWadFileEntries().size() + engineTextures.getWadFileEntries().size();
  for (  String textureFile : etFile) {
    updateStatus(i,total,ConvertProcess.TEXTURES);
    i++;
    Matcher matcher=pattern.matcher(textureFile);
    boolean found=matcher.find();
    if (found && Integer.parseInt(matcher.group("String_Node_Str")) == 0) {
      File f=etFile.extractFileData(textureFile,destination,OVERWRITE_DATA);
      File newFile=new File(f.toString().replaceFirst("String_Node_Str" + matcher.group("String_Node_Str"),"String_Node_Str"));
      if (OVERWRITE_DATA && newFile.exists()) {
        newFile.delete();
      }
 else       if (!OVERWRITE_DATA && newFile.exists()) {
        logger.log(Level.INFO,"String_Node_Str",newFile);
        f.delete();
        continue;
      }
      f.renameTo(newFile);
    }
 else     if (!found) {
      etFile.extractFileData(textureFile,destination,OVERWRITE_DATA);
    }
  }
  extractTextureContainer(i,total,frontEnd,destination);
  extractTextureContainer(i,total,engineTextures,destination);
}