code: public List<String> getModuleFileNames() {
  
          List<String> result = Lists.newArrayList();
          for (CmsModule module : OpenCms.getModuleManager().getAllInstalledModules()) {
              result.add(getFileNameForModule(module));
          }
          return result;
      }
docs: Gets the list of modules as file names.<p>
  
  @return the list of modules as file names