private Set<File> getFilesFromPreference(String preferenceName) {
		Set<File> set = new HashSet<>();
		String concatenatedFilePaths = Preferences.getProperty(preferenceName, "", true);
		String[] filePaths = concatenatedFilePaths.split(SEPARATOR);
		for (String filePath : filePaths) {
			filePath = filePath.trim();
			if (filePath.length() == 0) {
				continue;
			}
			Path path = new Path(filePath);
			ResourceFile resourceFile = path.getPath();
			if (resourceFile.exists()) {
				set.add(resourceFile.getFile(false));
			}
		}
		return set;
	}
Removes a listener to be notified when the list of FidFiles change.
@param listener the listener to no longer be notified.
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/db/FidFileManager.java