Thin wrapper around [Portex](https://crates.io/crates/portex) to be able to read the PE file embedded inside a XEX file transparently.
```rust
let xexfile = XexFile::open("default.xex")?;
```
`XexFile` contains 2 fields:
- -
Only accepts files starting with `58 45 58 32 00 00 00 01`.