diff --git a/README.md b/README.md
index 2f5aec8..8bca933 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,56 @@ For more details, please see:
 * [`findfst`](findfst): tool for finding values of signals from FST waveform, like `fstminer` tool that comes with GTKWave but more powerful.
 * [`clipfst`](clipfst): tool for clipping from FST waveform.
 
+## Building on Windows
+
+Windows requires additional setup due to dependencies that are not readily available:
+
+### Prerequisites
+
+- [Rust](https://rustup.rs/) (latest stable version)
+- [vcpkg](https://github.com/Microsoft/vcpkg) package manager
+- Visual Studio Build Tools or Visual Studio Community
+
+### Build Instructions
+
+1. **Install vcpkg:**
+
+   It comes preinstalled with Visual Studio, but if you don't have it yet, you can install it by running the following commands in PowerShell:
+   ```powershell
+   git clone https://github.com/Microsoft/vcpkg.git
+   cd vcpkg
+   .\bootstrap-vcpkg.bat
+   ```
+   (tested with vcpkg version 2025-02-11-bec4296bf5289dc9ce83b4f5095943e44162f9c2)
+
+2. **Install required packages:**
+   ```powershell
+   vcpkg install zlib:x64-windows-static-md
+   vcpkg install pthreads:x64-windows-static-md
+   vcpkg install mman:x64-windows-static-md
+   ```
+   (adjust vcpkg path as necessary, depending on whether it is on your PATH or not)
+
+3. **Build**
+   ```powershell
+   cargo build
+   ```
+
+**Note:** The build requires the `x64-windows-static-md` triplet for vcpkg packages to ensure compatibility with Rust's MSVC toolchain.
+
+### Troubleshooting
+```
+  thread 'main' panicked at fstapi\build.rs:19:8:
+  called `Result::unwrap()` on an `Err` value: LibNotFound("package zlib is not installed for vcpkg triplet x64-windows-static-md")
+  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
+```
+This error indicates that the `zlib` package is not found for the specified vcpkg triplet. Ensure that you have installed `zlib` using the correct triplet as shown in step 2 above.
+Similarly for pthreads or mman packages.
+
+Note that we're using pthreads (with an s) instead of pthread (without s) because the latter is deprecated in vcpkg.
+
+
+
 ## Rust Wrapper for FST C API
 
 This repository contains a Rust wrapper for the FST C API provided by GTKWave. See the [`fstapi`](fstapi) directory.
diff --git a/fstapi/Cargo.toml b/fstapi/Cargo.toml
index c11cd9f..96a8e69 100644
--- a/fstapi/Cargo.toml
+++ b/fstapi/Cargo.toml
@@ -14,3 +14,6 @@ license = "MIT OR Apache-2.0"
 [build-dependencies]
 bindgen = "0.64.0"
 cc = { version = "1.0.79", features = ["parallel"] }
+
+[target.'cfg(windows)'.build-dependencies]
+vcpkg = "0.2.15"
diff --git a/fstapi/build.rs b/fstapi/build.rs
index 6933c99..0296f58 100644
--- a/fstapi/build.rs
+++ b/fstapi/build.rs
@@ -1,26 +1,67 @@
-use std::{env, path::PathBuf};
+use std::{env, path::{PathBuf}};
 
 fn main() {
+
+  #[cfg(windows)]
+  let (zlib_include_dir, mman_include_dir) = {
+    // Find zlib via vcpkg.
+    let zlib = vcpkg::Config::new()
+      .emit_includes(true)
+      .find_package("zlib")
+      .unwrap();
+    let zlib_include_dir = zlib.include_paths[0].clone();
+
+    vcpkg::Config::new()
+      .find_package("pthreads")
+      .unwrap();
+
+    let mman = vcpkg::Config::new()
+      .find_package("mman")
+      .unwrap();
+
+    // vcpkg installs mman under `mman/sys/mman.h` path structure.
+    // We need to include the parent `mman` directory so that 
+    // fstapi.c can find `sys/mman.h` without modification.
+    let mman_base_path = mman.include_paths[0].clone();
+    let mman_include_dir = mman_base_path.join(PathBuf::from("mman"));
+
+    (zlib_include_dir, mman_include_dir)
+  };
+
   // Compile C sources to library.
-  cc::Build::new()
+  let mut cc_build = cc::Build::new();
+  cc_build
     .files(["csrc/fastlz.c", "csrc/fstapi.c", "csrc/lz4.c"])
     .define("FST_WRITER_PARALLEL", None)
     .include("csrc")
-    .flag_if_supported("-Wno-unused-but-set-variable")
-    .compile("fst");
+    .flag_if_supported("-Wno-unused-but-set-variable");
+
+  #[cfg(windows)]
+  cc_build.include(&zlib_include_dir).include(&mman_include_dir);
+
+  cc_build.compile("fst");
 
   // Rebuild if C source changes.
   println!("cargo:rerun-if-changed=csrc");
 
   // Link with zlib.
+  #[cfg(not(windows))]
   println!("cargo:rustc-link-lib=z");
 
   // Generate bindings.
-  let bindings = bindgen::Builder::default()
+  let mut bindgen_builder = bindgen::Builder::default()
     .header("csrc/fstapi.h")
     .allowlist_type(r#"(fst|FST_)\w+"#)
     .allowlist_function(r#"(fst|FST_)\w+"#)
     .allowlist_var(r#"(fst|FST_)\w+"#)
+    .clang_arg("-Icsrc");
+
+  #[cfg(windows)]
+  {
+    bindgen_builder = bindgen_builder.clang_arg(format!("-I{}", zlib_include_dir.display()));
+  }
+
+  let bindings = bindgen_builder
     .generate()
     .expect("failed to generate bindings");
 
diff --git a/fstapi/csrc/fst_win_unistd.h b/fstapi/csrc/fst_win_unistd.h
index 15ab2c1..37ae6a0 100644
--- a/fstapi/csrc/fst_win_unistd.h
+++ b/fstapi/csrc/fst_win_unistd.h
@@ -38,6 +38,8 @@
 #define unlink _unlink
 #define fileno _fileno
 #define lseek _lseeki64
+#define fseeko _fseeki64
+#define ftello _ftelli64
 
 #ifdef _WIN64
 #define ssize_t __int64
diff --git a/fstapi/src/reader.rs b/fstapi/src/reader.rs
index 7a8bcb6..e6952ff 100644
--- a/fstapi/src/reader.rs
+++ b/fstapi/src/reader.rs
@@ -4,7 +4,7 @@ use crate::utils::*;
 use crate::{capi, Error, Result};
 use std::marker::PhantomData;
 use std::num::NonZeroU32;
-use std::os::raw;
+use std::os::raw::{self};
 use std::path::Path;
 use std::{ptr, slice};
 
@@ -283,7 +283,7 @@ pub enum Hier<'a> {
 impl<'a> Hier<'a> {
   /// Creates a new hierarchy.
   fn new(hier: &'a capi::fstHier) -> Self {
-    match hier.htyp as u32 {
+    match hier.htyp as capi::fstHierType  {
       capi::fstHierType_FST_HT_SCOPE => Self::Scope(Scope(unsafe { &hier.u.scope })),
       capi::fstHierType_FST_HT_UPSCOPE => Self::Upscope,
       capi::fstHierType_FST_HT_VAR => Self::Var(Var(unsafe { &hier.u.var })),
@@ -382,6 +382,18 @@ impl<'a> Attr<'a> {
   /// [`ArrayType`](crate::consts::ArrayType),
   /// [`EnumValueType`](crate::consts::EnumValueType) or
   /// [`PackType`](crate::consts::PackType).
+  #[cfg(windows)]
+  pub fn subtype(&self) -> raw::c_int {
+    self.0.subtype as raw::c_int
+  }
+
+  /// Returns attribute subtype.
+  ///
+  /// The subtype may be one of [`MiscType`](crate::consts::MiscType),
+  /// [`ArrayType`](crate::consts::ArrayType),
+  /// [`EnumValueType`](crate::consts::EnumValueType) or
+  /// [`PackType`](crate::consts::PackType).
+  #[cfg(not(windows))]
   pub fn subtype(&self) -> raw::c_uint {
     self.0.subtype as raw::c_uint
   }