diff --git a/scripts/build_instrumentation.js b/scripts/build_instrumentation.js
index d79e4fb..9c4dc85 100644
--- a/scripts/build_instrumentation.js
+++ b/scripts/build_instrumentation.js
@@ -1,5 +1,6 @@
 import { execSync } from "node:child_process";
 import { existsSync, copyFileSync } from "node:fs";
+import { join, resolve } from "node:path";
 
 const env = process.env;
 
@@ -12,14 +13,15 @@ if (jIndex !== -1 && args[jIndex + 1]) {
 }
 
 function initEmscripten() {
-  const sdkPath = "third_party/emsdk/";
+  const sdkPath = resolve("third_party/emsdk/");
+  const emscriptenPath = join(sdkPath, "upstream", "emscripten");
 
-  env["PATH"] = `${sdkPath}:` + env["PATH"];
-  if (!existsSync(`${sdkPath}upstream/emscripten`)) {
+  env["PATH"] += `${process.platform === "win32" ? ";" : ":"}${sdkPath}`;
+  if (!existsSync(emscriptenPath)) {
     execSync("emsdk install 3.1.32", { encoding: "utf8", stdio: "inherit", env });
     execSync("emsdk activate 3.1.32", { encoding: "utf8", stdio: "inherit", env });
   }
-  env["PATH"] = `${sdkPath}upstream/emscripten:` + env["PATH"];
+  env["PATH"] += `${process.platform === "win32" ? ";" : ":"}${emscriptenPath}`;
 }
 
 initEmscripten();
diff --git a/src/core/compile.ts b/src/core/compile.ts
index f7b367f..70e4a7e 100644
--- a/src/core/compile.ts
+++ b/src/core/compile.ts
@@ -36,8 +36,8 @@ function getAscArgs(sources: string[], outputWasm: string, outputWat: string, fl
 
 async function unifiedCompile(testCodePaths: string[], option: CompileOption): Promise<string> {
   const { outputFolder, flags } = option;
-  const outputWasm = join(outputFolder, "test.wasm");
-  const outputWat = join(outputFolder, "test.wat");
+  const outputWasm = join(outputFolder, "test.wasm").replaceAll(/\\/g, "/");
+  const outputWat = join(outputFolder, "test.wat").replaceAll(/\\/g, "/");
   const ascArgv = getAscArgs(testCodePaths, outputWasm, outputWat, flags);
   await ascMain(ascArgv, false);
   return outputWasm;
diff --git a/src/interface.ts b/src/interface.ts
index da44f0e..edc3744 100644
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -5,13 +5,13 @@
 
 import { Type } from "wasmparser";
 import { ASUtil } from "@assemblyscript/loader";
-import path from "node:path";
+import { relative } from "node:path";
 
 // instrumented file information
 export class InstrumentResult {
   baseName: string;
   constructor(baseName: string) {
-    this.baseName = path.relative(process.cwd(), baseName);
+    this.baseName = relative(process.cwd(), baseName).replaceAll(/\\/g, "/");
   }
   get sourceWasm() {
     return this.baseName.concat(".wasm");