@Override
	public void setContentTypeVersion(int version) throws IOException {
		if (fileSystem.isReadOnly()) {
			throw new ReadOnlyException();
		}
		synchronized (fileSystem) {
			synchronized (this) {
				propertyFile.putInt(CONTENT_TYPE_VERSION, version);
				propertyFile.writeState();
			}
			fireItemChanged();
		}
	}
@see ghidra.framework.store.FolderItem#setReadOnly(boolean)
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/LocalFolderItem.java