public synchronized ItemCheckoutStatus checkout(String user) throws IOException {
		throw new IOException(propertyFile.getName() +
			" may not be checked-out, item may be corrupt");
	}
Get the file type
@return file type or -1 if unspecified
Ghidra/Framework/FileSystem/src/main/java/ghidra/framework/store/local/UnknownFolderItem.java