diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ad31104
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "rsfus"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..e1bb776
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,105 @@
+use std::env;
+use std::fs::File;
+use std::io::{Read, Write};
+use std::path::Path;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    let iso_mount_dir = Path::new(args.get(1)
+        .expect("Arguments: rsfus (path to XP ISO mount)"))
+        .canonicalize().expect("Can't canonicalize path to XP ISO mount.");
+
+    if !iso_mount_dir.exists() || !iso_mount_dir.is_dir() {
+        panic!("XP ISO mount is not a directory.");
+    }
+
+    let amd64_basedir = iso_mount_dir.join("amd64");
+    let i386_basedir = iso_mount_dir.join("i386");
+
+    {
+        let mut ntdetect = File::open(amd64_basedir.join("ntdetect.com"))
+            .or(File::open(i386_basedir.join("ntdetect.com")))
+            .expect("Can't open file ntdetect.com.");
+        let mut ntdetect_copy = File::create(iso_mount_dir.join("ntdetect.com"))
+            .expect("Can't create file ntdetect.com.");
+
+        let mut ntdetect_contents = Vec::new();
+        println!("Reading {ntdetect:?}");
+        ntdetect.read_to_end(&mut ntdetect_contents).expect("Can't read ntdetect.com.");
+        println!("Writing {ntdetect_copy:?}");
+        ntdetect_copy.write_all(&ntdetect_contents).expect("Can't write to ntdetect.com.");
+    }
+
+    {
+        let mut txtsetup = File::open(amd64_basedir.join("txtsetup.sif"))
+            .or(File::open(i386_basedir.join("txtsetup.sif")))
+            .expect("Can't open file txtsetup.sif");
+        let mut txtsetup_copy = File::create(iso_mount_dir.join("txtsetup.sif"))
+            .expect("Can't create file txtsetup.sif");
+
+        let mut txtsetup_contents = String::new();
+        println!("Reading {txtsetup:?}");
+        txtsetup.read_to_string(&mut txtsetup_contents).expect("Can't read from txtsetup.sif.");
+        let mut txtsetup_lines: Vec<&str> = Vec::new();
+        for line in txtsetup_contents.lines() {
+            txtsetup_lines.push(line);
+            if line == "[SetupData]" {
+                println!("TXTSETP: Found [SetupData]");
+                txtsetup_lines.push(r#"SetupSourceDevice = "\device\harddisk1\partition1""#);
+            }
+        }
+        println!("Writing {txtsetup_copy:?}");
+        txtsetup_copy.write_all(txtsetup_lines.join("\r\n").as_bytes())
+            .expect("Couldn't write to txtsetup.sif.");
+    }
+
+    {
+        let mut bootmgr = File::open(amd64_basedir.join("setupldr.bin"))
+            .or(File::open(i386_basedir.join("setupldr.bin")))
+            .expect("Can't open file setupldr.bin");
+        let mut bootmgr_copy = File::create(iso_mount_dir.join("BOOTMGR"))
+            .expect("Can't create file BOOTMGR");
+
+        let mut bootmgr_contents = Vec::new();
+        println!("Reading {bootmgr:?}");
+        bootmgr.read_to_end(&mut bootmgr_contents).expect("Can't read from setupldr.bin");
+
+        if bootmgr_contents.len() > 0x2061
+            && bootmgr_contents[0x2060] == 0x74
+            && bootmgr_contents[0x2061] == 0x03 {
+            bootmgr_contents[0x2060] = 0xeb;
+            bootmgr_contents[0x2061] = 0x1a;
+            println!("BOOTMGR: 0x00002060  0x74 0x03  -->  0xeb 0x1a  (Disable Win2k3 CRC check)");
+        }
+
+        let rdisk0 = b"rdisk(0)".as_slice();
+        let win_nt_bt = b"$win_nt$.~bt".as_slice();
+        let win_nt_bt_caps = b"$WIN_NT$.~BT".as_slice();
+        let amd64_bytes = b"amd64";
+
+        for index in 0..(bootmgr_contents.len() - win_nt_bt.len()) {
+            if &bootmgr_contents[index..index+rdisk0.len()] == rdisk0 {
+                println!("BOOTMGR: {index:#010x}  Patching rdisk(0)  -->  rdisk(1)");
+                bootmgr_contents[index+6] = 0x31;
+            }
+
+            // $WIN_NT$_~BT -> i386/amd64
+            if &bootmgr_contents[index..index+win_nt_bt.len()] == win_nt_bt
+                || &bootmgr_contents[index..index+win_nt_bt.len()] == win_nt_bt_caps {
+                println!("BOOTMGR: {index:#010x}  Patching {:?}  -->  \"amd64\"", bootmgr_contents[index..index+win_nt_bt.len()].to_vec());
+                for i in 0..amd64_bytes.len() {
+                    bootmgr_contents[index+i] = amd64_bytes[i];
+                }
+                bootmgr_contents[index + amd64_bytes.len()] = 0;
+                bootmgr_contents[index + amd64_bytes.len()] = bootmgr_contents[index + win_nt_bt.len()];
+                bootmgr_contents[index + amd64_bytes.len() + 1] = 0;
+            }
+        }
+
+        println!("Writing {bootmgr_copy:?}");
+        bootmgr_copy.write_all(bootmgr_contents.as_slice()).expect("Couldn't write to BOOTMGR");
+    }
+
+    println!("Done!  :D");
+}