When a file is opened, the default program used to open the file (also called the file association or handler) is checked.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: When a file is opened, the default program used to open the file (also called the file association or handler) is checked. ### Response: T1042.