public FidFile addUserFidFile(File file) {
		loadFidFiles();
		FidFile fidFile = findExistingFidFile(file);
		if (fidFile != null) {
			return fidFile;
		}

		fidFile = new FidFile(this, file, false);
		if (fidFile.isValidFile()) {
			fidFiles.add(fidFile);
			saveToPreferences();
			notifyListeners();
			return fidFile;
		}
		return null;
	}
Add user FidDb file
@param file
@return FidFile or null if invalid
Ghidra/Features/FunctionID/src/main/java/ghidra/feature/fid/db/FidFileManager.java