private File fixFilenameSuffix(File file) {
		String filename = file.getName();
		if (filename.endsWith(FileDataTypeManager.SUFFIX)) {
			return file;
		}
		filename += FileDataTypeManager.SUFFIX;
		return new File(file.getParentFile(), filename);
	}
Shows this filechooser and uses the given suggested filename as the default filename
@param suggestedFileName The default name to show in the name field
@return the file selected by the user, or null if no selection was made
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/ArchiveFileChooser.java