diff --git a/.github/workflows/selftest.yml b/.github/workflows/selftest.yml
index 2908ed0..aa43acc 100644
--- a/.github/workflows/selftest.yml
+++ b/.github/workflows/selftest.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu', 'macos'] # TODO: add windows
+        os: ['ubuntu', 'macos', 'windows']
 
     name: on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}-latest
diff --git a/index.js b/index.js
index 8fa3c3c..78324b0 100644
--- a/index.js
+++ b/index.js
@@ -4,36 +4,40 @@ const fs = require("fs")
 const { execSync } = require("child_process")
 
 async function downloadRelease(octokit, os, org, repo, release, token) {
+    const postfix = `_${os}_amd64.${os === "windows" ? "zip" : "tar.gz"}`;
+    const tempdir = os === "windows" ? process.env.TEMP + "\\" : "/tmp/";
+    const extract = os === "windows" ? "tar -xvf" : "tar -xvzf";
+    const archive = `${tempdir}gotestfmt${postfix}`;
     const releaseAssets = await octokit.rest.repos.listReleaseAssets({
         owner: org,
         repo: repo,
         release_id: release.id,
     })
-    tarPostfix = `_${os}_amd64.tar.gz`
+    
     for (let asset of releaseAssets.data) {
         console.log("Examining release asset " + asset.name + " at " + asset.browser_download_url + " ...")
-        if (asset.name.endsWith(tarPostfix)) {
-            console.log("Found Linux binary named " + asset.name + " at " + asset.browser_download_url + " , attempting download...")
+        if (asset.name.endsWith(postfix)) {
+            console.log("Found binary named " + asset.name + " at " + asset.browser_download_url + " , attempting download...")
             if (token) {
-                execSync("curl -L -o /tmp/gotestfmt.tar.gz -H \"Authorization: Bearer " + token + "\" " + asset.browser_download_url)
+                execSync(`curl -L -o ${archive} -H "Authorization: Bearer ${token}" ${asset.browser_download_url}`)
             } else {
-                execSync("curl -L -o /tmp/gotestfmt.tar.gz " + asset.browser_download_url)
+                execSync(`curl -L -o ${archive} ${asset.browser_download_url}`)
             }
-            console.log("Creating /usr/local/lib/gotestfmt directory...")
-            execSync("sudo mkdir -p /usr/local/lib/gotestfmt")
-            console.log("Unpacking tar file...")
-            execSync("cd /usr/local/lib/gotestfmt && sudo tar -xvzf /tmp/gotestfmt.tar.gz")
-            console.log("Removing tarball...")
-            fs.unlinkSync("/tmp/gotestfmt.tar.gz")
-            console.log("Creating /usr/local/bin directory if it does not exist already...")
-            execSync("sudo mkdir -p /usr/local/bin")
-            console.log("Linking gotestfmt...")
-            execSync("sudo ln -s /usr/local/lib/gotestfmt/gotestfmt /usr/local/bin/gotestfmt")
+
+            console.log("Unpacking archive file...")
+            core.addPath(process.env.GITHUB_WORKSPACE)
+            process.chdir(process.env.GITHUB_WORKSPACE)
+            execSync(`${extract} "${archive}"`)
+
+            console.log("Removing asset archive...")
+            fs.unlinkSync(archive)
+
             console.log("Successfully set up gotestfmt.")
             return
         }
     }
-    throw `No release asset matched postfix '${tarPostfix}'.`
+
+    throw `No release asset matched postfix '${postfix}'.`
 }
 
 async function downloadGofmt(octokit, version, versionPrefix, os, org, repo, token) {
@@ -73,8 +77,16 @@ async function downloadGofmt(octokit, version, versionPrefix, os, org, repo, tok
 }
 
 async function determineOS() {
-    const os = execSync("uname").toString().trim().toLowerCase()
+    const uname = execSync("uname")
+
+    let os = uname.toString().trim().toLowerCase()
+    if (os.indexOf("msys_nt") === 0)
+    {
+        os = "windows";
+    }
+
     console.log(`Running on OS '${os}'`)
+
     return os
 }