private static List<File> findExtensionPropertyFiles(File installDir) {

		List<File> results = new ArrayList<>();
		FileUtilities.forEachFile(installDir, f -> {
			if (!f.isDirectory() || f.getName().equals("Skeleton")) {
				return;
			}

			File pf = getPropertyFile(f);
			if (pf != null) {
				results.add(pf);
			}
		});

		return results;
	}
Returns a list of files representing all the <code>extension.properties</code> files found
under a given directory. This will only search the immediate children of the given directory.
<p>
Searching the child directories of a directory allows clients to pick an extension parent
directory that contains multiple extension directories.

@param installDir the directory that contains extension subdirectories
@return list of extension.properties files
Ghidra/Framework/Generic/src/main/java/ghidra/util/extensions/ExtensionUtils.java