@Override
	public int getLocalCheckoutVersion() {
		synchronized (fileSystem) {
			if (isVersioned) {
				throw new UnsupportedOperationException(
					"getLocalCheckoutVersion is not applicable to versioned item");
			}
			return propertyFile.getInt(LOCAL_CHECKOUT_VERSION, -1);
		}
	}
@see ghidra.framework.store.FolderItem#setReadOnly(boolean)
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/LocalFolderItem.java