diff --git a/Cargo.lock b/Cargo.lock
index f776354..31d64ea 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,6 +73,25 @@ version = "3.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
 
+[[package]]
+name = "cbindgen"
+version = "0.29.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "975982cdb7ad6a142be15bdf84aea7ec6a9e5d4d797c004d43185b24cfe4e684"
+dependencies = [
+ "clap",
+ "heck",
+ "indexmap",
+ "log",
+ "proc-macro2",
+ "quote",
+ "serde",
+ "serde_json",
+ "syn",
+ "tempfile",
+ "toml 0.8.23",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.3"
@@ -184,6 +203,24 @@ dependencies = [
  "windows-sys 0.60.2",
 ]
 
+[[package]]
+name = "fastrand"
+version = "2.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37909eebbb50d72f9059c3b6d82c0463f2ff062c9e95845c43a6c9c0355411be"
+
+[[package]]
+name = "getrandom"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "899def5c37c4fd7b2664648c28120ecec138e4d395b459e5ca34f9cce2dd77fd"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasip2",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.16.0"
@@ -212,6 +249,12 @@ version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "itoa"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
+
 [[package]]
 name = "js-sys"
 version = "0.3.81"
@@ -314,6 +357,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "r-efi"
+version = "5.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -371,6 +420,12 @@ version = "1.0.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
+[[package]]
+name = "ryu"
+version = "1.0.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28d3b2b1366ec20994f1fd18c3c594f05c5dd4bc44d8bb0c1c632c8d6829481f"
+
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -407,6 +462,28 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.145"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "402a6f66d8c709116cf22f558eab210f5a50187f702eb4d7e5ef38d9a7f1c79c"
+dependencies = [
+ "itoa",
+ "memchr",
+ "ryu",
+ "serde",
+ "serde_core",
+]
+
+[[package]]
+name = "serde_spanned"
+version = "0.6.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf41e0cfaf7226dca15e8197172c295a782857fcb97fad1808a166870dee75a3"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_spanned"
 version = "1.0.3"
@@ -439,6 +516,19 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempfile"
+version = "3.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d31c77bdf42a745371d260a26ca7163f1e0924b64afa0b688e61b5a9fa02f16"
+dependencies = [
+ "fastrand",
+ "getrandom",
+ "once_cell",
+ "rustix",
+ "windows-sys 0.60.2",
+]
+
 [[package]]
 name = "thiserror"
 version = "2.0.17"
@@ -459,6 +549,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "toml"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc1beb996b9d83529a9e75c17a1686767d148d70663143c7854d8b4a09ced362"
+dependencies = [
+ "serde",
+ "serde_spanned 0.6.9",
+ "toml_datetime 0.6.11",
+ "toml_edit",
+]
+
 [[package]]
 name = "toml"
 version = "0.9.8"
@@ -467,13 +569,22 @@ checksum = "f0dc8b1fb61449e27716ec0e1bdf0f6b8f3e8f6b05391e8497b8b6d7804ea6d8"
 dependencies = [
  "indexmap",
  "serde_core",
- "serde_spanned",
- "toml_datetime",
+ "serde_spanned 1.0.3",
+ "toml_datetime 0.7.3",
  "toml_parser",
  "toml_writer",
  "winnow",
 ]
 
+[[package]]
+name = "toml_datetime"
+version = "0.6.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22cddaf88f4fbc13c51aebbf5f8eceb5c7c5a9da2ac40a13519eb5b0a0e8f11c"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "toml_datetime"
 version = "0.7.3"
@@ -483,6 +594,20 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "toml_edit"
+version = "0.22.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
+dependencies = [
+ "indexmap",
+ "serde",
+ "serde_spanned 0.6.9",
+ "toml_datetime 0.6.11",
+ "toml_write",
+ "winnow",
+]
+
 [[package]]
 name = "toml_parser"
 version = "1.0.4"
@@ -492,6 +617,12 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "toml_write"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d99f8c9a7727884afe522e9bd5edbfc91a3312b36a77b5fb8926e4c31a41801"
+
 [[package]]
 name = "toml_writer"
 version = "1.0.4"
@@ -532,6 +663,15 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "wasip2"
+version = "1.0.1+wasi-0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0562428422c63773dad2c345a1882263bbf4d65cf3f42e90921f787ef5ad58e7"
+dependencies = [
+ "wit-bindgen",
+]
+
 [[package]]
 name = "wasm-bindgen"
 version = "0.2.104"
@@ -607,6 +747,7 @@ dependencies = [
 name = "wfassoc_dylib"
 version = "0.1.0"
 dependencies = [
+ "cbindgen",
  "thiserror",
  "wfassoc",
 ]
@@ -619,7 +760,7 @@ dependencies = [
  "comfy-table",
  "serde",
  "thiserror",
- "toml",
+ "toml 0.9.8",
  "wfassoc",
 ]
 
@@ -803,6 +944,9 @@ name = "winnow"
 version = "0.7.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "21a0236b59786fed61e2a80582dd500fe61f18b5dca67a4a067d0bc9039339cf"
+dependencies = [
+ "memchr",
+]
 
 [[package]]
 name = "winreg"
@@ -813,3 +957,9 @@ dependencies = [
  "cfg-if",
  "windows-sys 0.59.0",
 ]
+
+[[package]]
+name = "wit-bindgen"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f17a85883d4e6d00e8a97c586de764dabcc06133f7f1d55dce5cdc070ad7fe59"
diff --git a/README.md b/README.md
index f8640aa..148e5d5 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ and provide it and `wfassoc_exec` with your executable.
 By executing `wfassoc_exec` with this TOML file in your executable,
 you can simply achieve this goal and analyze its return value to check whether it success.
 
-However, if you are prefering taht let user decide which file associations should be created,
+However, if you are prefering that let user decide which file associations should be created,
 even have an UI displaying all current file association related with this program (like 7-Zip File Manager does),
 you can choose `wfassoc_dylib` for your solution.
 `wfassoc_dylib` expose all essential functions for this task.
diff --git a/example/ppic.toml b/example/ppic.toml
index 1721778..5521927 100644
--- a/example/ppic.toml
+++ b/example/ppic.toml
@@ -1,12 +1,40 @@
+# Identifier is used as an unique symbol for your program.
+# Please choose it carefully to avoid any name conflict.
+# 
+# The value of identifier should only contain alphabet chars and digits and 
+# digits should not be the first char (like C variable naming convention).
+# 
+# More preciously, this identifier is used as the "vendor" part of ProgId.
 identifier = "PineapplePicture"
+# The fully qualified path to the application.
+# 
+# A fully qualified path or absolute path always defines an exact path 
+# from a particular drive or device to a target file or directory, 
+# and does not depend on the current drive or current directory.
+# 
+# Considering Windows use back-slash as path splittor, which is frequently used as escape char,
+# you can utilize "literal strings" syntax in this TOML file to quickly write this path 
+# as this example following does.
 path = 'C:\path\to\ppic.exe'
+# CLSID is an unique UUID or GUID of your program.
 clsid = "{B5291320-FE7C-4069-BF87-A0AC327FCD20}"
 
 [manners]
+# Each manner has a name as its key, and detailed command line arguments list as its value.
+# The name of manner will be used sonner for associating with specific file extension.
+# The command line arguments indicate which program should be executed and how to configure their arguments.
+#
+# Also, you can utilize "literal strings" syntax to write this pair,
+# because quotes usually need special escape in "basic string" syntax.
 common = '"C:\path\to\ppic.exe" "%1"'
 
+# "exts" list hold all potential file extensions related with this program,
+# and the correct manner for opening them.
 [exts]
+# In this case, we bind ".jpg" file extension with "common" manner for opening
+# which was defined above.
 ".jpg" = "common"
+# Set more file extensions with manner defined above.
 ".jfif" = "common"
 ".gif" = "common"
 ".bmp" = "common"
diff --git a/wfassoc/src/lib.rs b/wfassoc/src/lib.rs
index 7c3a9a3..4fc6a0a 100644
--- a/wfassoc/src/lib.rs
+++ b/wfassoc/src/lib.rs
@@ -125,6 +125,7 @@ impl From<Scope> for View {
 /// or more preciously, the consititution of command arguments passed to program.
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Manner {
+    // TODO: use specialized WinArg instead.
     argv: String,
 }
 
@@ -147,6 +148,7 @@ impl Display for Manner {
 // region: Program
 
 /// The struct representing a complete program for registration and unregistration.
+#[derive(Debug)]
 pub struct Program {
     /// The identifier of this program.
     identifier: String,
diff --git a/wfassoc_dylib/Cargo.toml b/wfassoc_dylib/Cargo.toml
index 850493f..b458c3f 100644
--- a/wfassoc_dylib/Cargo.toml
+++ b/wfassoc_dylib/Cargo.toml
@@ -6,6 +6,12 @@ edition = "2024"
 description = "The dynamic wfassoc library exposed for C/C++ and other languages users."
 license = "SPDX:MIT"
 
+[lib]
+crate-type = ["cdylib"]
+
 [dependencies]
 thiserror = { workspace = true }
 wfassoc = { path="../wfassoc" }
+
+[build-dependencies]
+cbindgen = "0.29.0"
diff --git a/wfassoc_dylib/src/lib.rs b/wfassoc_dylib/src/lib.rs
index b93cf3f..e4f99f9 100644
--- a/wfassoc_dylib/src/lib.rs
+++ b/wfassoc_dylib/src/lib.rs
@@ -1,14 +1,5 @@
-pub fn add(left: u64, right: u64) -> u64 {
+
+#[unsafe(no_mangle)]
+pub extern "C" fn WFAdd(left: u32, right: u32) -> u32 {
     left + right
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
diff --git a/wfassoc_exec/src/main.rs b/wfassoc_exec/src/main.rs
index 8a697b6..1048207 100644
--- a/wfassoc_exec/src/main.rs
+++ b/wfassoc_exec/src/main.rs
@@ -2,7 +2,10 @@ pub(crate) mod cli;
 pub(crate) mod manifest;
 
 use clap::Parser;
-use std::{collections::HashMap, path::Path, process};
+use std::collections::HashMap;
+use std::path::{Path, PathBuf};
+use std::process;
+use std::str::FromStr;
 use thiserror::Error as TeError;
 use wfassoc::{Program, Token};
 use cli::{Cli, Commands};
@@ -39,9 +42,9 @@ fn build_program(cli: &Cli) -> Result<Program> {
     // Open file and read manifest TOML file
     let mf = Manifest::from_file(&cli.config_file)?;
     // Create instance
-    let rv = Program::new(&mf.identifier, &Path::from(mf.path.as_str()))?;
+    let mut rv = Program::new(&mf.identifier, PathBuf::from_str(&cli.config_file).unwrap().as_path())?;
     // Setup manner
-    let manners: HashMap<&str, Token> = HashMap::new();
+    let mut manners: HashMap<&str, Token> = HashMap::new();
     for (k, v) in mf.manners.iter() {
         let token = rv.add_manner(v.as_str())?;
         manners.insert(k.as_str(), token);
@@ -72,7 +75,8 @@ fn run_unregister(cli: &Cli) -> Result<()> {
 }
 
 fn run_query(cli: &Cli) -> Result<()> {
-    
+    let program = build_program(cli)?;
+    print!("{:?}", program);
     Ok(())
 }