private void collectSystemEnvProperties(String propertiesFileName, @Nullable String prefix, List<Object> result, Set<String> variants) {
    VirtualFile virtualFile = MavenPropertiesVirtualFileSystem.getInstance().findFileByPath(propertiesFileName);
    PropertiesFile file = MavenDomUtil.getPropertiesFile(myProject, virtualFile);
    collectPropertiesFileVariants(file, prefix, result, variants);
  }
private void collectSystemEnvProperties(String propertiesFileName, @Nullable String prefix, List<Object> result, Set<String> variants)