diff --git a/src/services/evaluator.ts b/src/services/evaluator.ts
index 6a30001..d9356bc 100644
--- a/src/services/evaluator.ts
+++ b/src/services/evaluator.ts
@@ -224,6 +224,10 @@ async function loadConfig(configPath: string): Promise<EvalConfig> {
 }
 
 async function findCopilotCliPath(): Promise<string> {
+  if (process.platform === "win32") {
+    return "copilot";
+  }
+
   // Try standard PATH first
   try {
     const { stdout } = await execFileAsync("which", ["copilot"], { timeout: 5000 });
diff --git a/src/services/instructions.ts b/src/services/instructions.ts
index a1ea882..3ff216f 100644
--- a/src/services/instructions.ts
+++ b/src/services/instructions.ts
@@ -90,6 +90,10 @@ Output ONLY the markdown content for the instructions file.`;
 const execFileAsync = promisify(execFile);
 
 async function findCopilotCliPath(): Promise<string> {
+  if (process.platform === "win32") {
+    return "copilot";
+  }
+
   // Try standard PATH first
   try {
     const { stdout } = await execFileAsync("which", ["copilot"], { timeout: 5000 });
@@ -122,6 +126,10 @@ async function findCopilotCliPath(): Promise<string> {
 async function assertCopilotCliReady(): Promise<string> {
   const cliPath = await findCopilotCliPath();
   
+  if (process.platform === "win32" && cliPath === "copilot") {
+    return cliPath;
+  }
+  
   try {
     await execFileAsync(cliPath, ["--version"], { timeout: 5000 });
   } catch {