In Rust, file I/O is handled through the standard library's `std::fs` module, which provides functions and types for working with files and directories. Here's an overview of how to handle file I/O operations in Rust:

1. Opening a File :
   * To open a file, you can use the `std::fs::File::open` function, which returns a `Result<File, std::io::Error>`:

     use std::fs::File;
     
     let file = File::open("path/to/file.txt");​

   * The `open` function takes a file path as a parameter and returns a `Result` that can be either `Ok(file)` if the file is successfully opened or `Err(error)` if an error occurs.

2. Reading from a File :
   * Once you have a file handle, you can read its contents using methods available on the `File` type, such as `read_to_string`, `read`, or `BufRead` traits.

     use std::fs::File;
     use std::io::Read;
     
     let mut file = File::open("path/to/file.txt")?;
     
     let mut contents = String::new();
     file.read_to_string(&mut contents)?;
     
     println!("File contents: {}", contents);​

3. Writing to a File :
   * To write data to a file, you can use the `std::fs::File::write` or `std::fs::File::write_all` methods. These methods take a buffer or a slice of bytes as input and write it to the file.

     use std::fs::File;
     use std::io::Write;
     
     let mut file = File::create("path/to/file.txt")?;
     
     file.write_all(b"Hello, World!")?;​

4. Appending to a File :
   * If you want to append data to an existing file, you can use the `std::fs::OpenOptions` type to open the file with the append mode enabled.

     use std::fs::OpenOptions;
     use std::io::Write;
     
     let mut file = OpenOptions::new()
         .append(true)
         .open("path/to/file.txt")?;
     
     file.write_all(b"Appended content")?;​

5. Closing a File :
   * Rust's file handles are automatically closed when they go out of scope. Therefore, there's no need to explicitly close a file. The file will be closed and its resources will be released when the variable holding the file handle goes out of scope.

6. Handling Errors :
   * File I/O operations can result in various errors, such as file not found, permission denied, or disk full. It's important to handle these errors appropriately. Rust's `std::io::Result` type is used to handle I/O errors, and it provides methods like `unwrap`, `expect`, or pattern matching to handle the result.

     use std::fs::File;
     
     let file = File::open("path/to/file.txt");
     
     match file {
         Ok(f) => {
             // File successfully opened
         },
         Err(e) => {
             // Error handling
             println!("Error: {}", e);
         }
     }​

This is just a basic overview of file I/O in Rust. The `std::fs` module provides more functions and types for advanced file operations, such as metadata querying, directory operations, renaming files, and more. Be sure to consult the Rust documentation for more details and examples on file I/O operations.