in log4j-changelog/src/main/java/org/apache/logging/log4j/changelog/exporter/ChangelogExporter.java [256:261]
private static String templateName(final Path changelogDirectory, final Path path) {
final Path relativePath = changelogDirectory.relativize(path);
return File.pathSeparatorChar == '/'
? relativePath.toString()
: relativePath.toString().replace('\\', '/');
}