diff --git a/README.md b/README.md
index a78770a..5cff6f8 100644
--- a/README.md
+++ b/README.md
@@ -106,9 +106,10 @@ py -m plugin_helper
 py -m plugin_helper --config plugin-helper.windows.toml --profile windows installed --instance 1.44.1
 ```
 
-On native Windows, `bootstrap` runs `IPA.exe -n` directly instead of through
-Proton. `bootstrap-check` accepts a recorded native bootstrap without requiring
-`Logs/_latest.log` when `IPA.exe -n` completed successfully.
+On native Windows, `bootstrap` runs `IPA.exe "Beat Saber.exe" -n` directly
+instead of through Proton. `bootstrap-check` accepts a recorded native bootstrap
+without requiring `Logs/_latest.log` when `IPA.exe "Beat Saber.exe" -n`
+completed successfully.
 
 When no config file is present on Windows, defaults are
 `~/BSManager/BSInstances` and `%LOCALAPPDATA%/plugin-helper`.
@@ -212,10 +213,10 @@ custom content or non-obvious user choices rather than pure cache data.
   arguments such as `--no-yeet fpfc` can make the game fail command-line
   parsing after BSIPA and plugins have already loaded.
 - BSIPA is managed as a first-class bootstrap phase. The `bootstrap` command
-  applies the locked `bsipa` root archive, runs `IPA.exe -n` (natively on
-  Windows or through Proton on Linux), and records every bootstrap-relevant
-  file under root `IPA.exe*`, `winhttp.dll`, `Libs/`, and `IPA/`, including
-  backups created during patching.
+  applies the locked `bsipa` root archive, runs `IPA.exe "Beat Saber.exe" -n`
+  (natively on Windows or through Proton on Linux), and records every
+  bootstrap-relevant file under root `IPA.exe*`, `winhttp.dll`, `Libs/`, and
+  `IPA/`, including backups created during patching.
 - If an instance version lock includes `bsipa`, ordinary plugin plans require a
   recorded bootstrap state plus a `Logs/_latest.log` that shows BSIPA startup.
   Use `bootstrap-check` before planning a batch when you want a quick gate.
diff --git a/docs/notes/windows-compatibility.md b/docs/notes/windows-compatibility.md
index cef71a3..4363ab0 100644
--- a/docs/notes/windows-compatibility.md
+++ b/docs/notes/windows-compatibility.md
@@ -48,13 +48,13 @@ Windows instances.
 ### Done
 
 - Add native Windows bootstrap support.
-  - `bootstrap` auto-detects Windows and runs `IPA.exe -n` directly.
+  - `bootstrap` auto-detects Windows and runs `IPA.exe "Beat Saber.exe" -n` directly.
   - `--native` forces native mode; `--proton` remains for Linux/Proton installs.
   - Timeout cleanup uses `process.terminate()` / `process.kill()` on Windows
     instead of POSIX process groups.
   - Bootstrap state records `bootstrapMode: "native"` or `"proton"`.
 - `bootstrap-check` accepts recorded native Windows bootstrap state without
-  `Logs/_latest.log` when `IPA.exe -n` completed successfully
+  `Logs/_latest.log` when `IPA.exe "Beat Saber.exe" -n` completed successfully
   (`ipaExitCode == 0`, not timed out).
 - Add Windows-aware default paths when no config is present:
   `~/BSManager/BSInstances` and `%LOCALAPPDATA%/plugin-helper`.
diff --git a/registry/plugins/beatleader.toml b/registry/plugins/beatleader.toml
index fffdc03..38d4cc3 100644
--- a/registry/plugins/beatleader.toml
+++ b/registry/plugins/beatleader.toml
@@ -10,5 +10,6 @@ dependencies = [
   { id = "songcore", constraint = ">=3.16.0" },
   { id = "sirautil", constraint = ">=3.3.1" },
   { id = "system-io-compression", constraint = ">=4.6.0" },
+  { id = "system-io-compression-filesystem", constraint = ">=4.7.3056" },
   { id = "bsipa", constraint = ">=4.3.7" },
 ]
diff --git a/src/plugin_helper/bootstrap.py b/src/plugin_helper/bootstrap.py
index ba16430..a8d74e7 100644
--- a/src/plugin_helper/bootstrap.py
+++ b/src/plugin_helper/bootstrap.py
@@ -140,11 +140,12 @@ def build_bootstrap_command(
     proton: Path | None = None,
     native: bool | None = None,
 ) -> list[str]:
+    beat_saber_exe = ipa.with_name("Beat Saber.exe")
     use_native = is_windows() if native is None else native
     if use_native:
-        return [str(ipa), "-n"]
+        return [str(ipa), str(beat_saber_exe), "-n"]
     proton_path = proton or _default_proton()
-    return [str(proton_path), "run", str(ipa), "-n"]
+    return [str(proton_path), "run", str(ipa), str(beat_saber_exe), "-n"]
 
 
 def _terminate_process(process: subprocess.Popen[str]) -> None:
@@ -249,15 +250,18 @@ def run_bootstrap(
     ipa = instance_path / "IPA.exe"
     if not ipa.is_file():
         raise FileNotFoundError(f"BSIPA archive did not install IPA.exe: {ipa}")
+    beat_saber_exe = instance_path / "Beat Saber.exe"
+    if not beat_saber_exe.is_file():
+        raise FileNotFoundError(f"Beat Saber executable not found: {beat_saber_exe}")
 
     command = build_bootstrap_command(ipa, proton=proton, native=use_native)
     if use_native:
-        tell(f"Running IPA.exe -n natively; timeout {ipa_timeout_seconds}s")
+        tell(f"Running IPA.exe \"Beat Saber.exe\" -n natively; timeout {ipa_timeout_seconds}s")
     else:
         proton_path = proton or _default_proton()
         if not proton_path.is_file():
             raise FileNotFoundError(f"Proton executable not found: {proton_path}")
-        tell(f"Running IPA.exe -n through Proton; timeout {ipa_timeout_seconds}s")
+        tell(f"Running IPA.exe \"Beat Saber.exe\" -n through Proton; timeout {ipa_timeout_seconds}s")
 
     completed = _run_ipa(
         command=command,
@@ -265,7 +269,7 @@ def run_bootstrap(
         timeout_seconds=ipa_timeout_seconds,
         native=use_native,
     )
-    tell("Scanning bootstrap files after IPA.exe -n")
+    tell("Scanning bootstrap files after IPA.exe \"Beat Saber.exe\" -n")
     after = scan_bootstrap_files(instance_path)
     delta = _files_delta(before, after)
     state: dict[str, Any] = {
diff --git a/tests/test_plugin_helper.py b/tests/test_plugin_helper.py
index 9117a93..a0cb670 100644
--- a/tests/test_plugin_helper.py
+++ b/tests/test_plugin_helper.py
@@ -319,14 +319,17 @@ state_dir = "config-state"
 
     def test_build_bootstrap_command_native(self) -> None:
         ipa = Path("C:/Games/Beat Saber/IPA.exe")
-        self.assertEqual(build_bootstrap_command(ipa, native=True), [str(ipa), "-n"])
+        self.assertEqual(
+            build_bootstrap_command(ipa, native=True),
+            [str(ipa), str(ipa.with_name("Beat Saber.exe")), "-n"],
+        )
 
     def test_build_bootstrap_command_proton(self) -> None:
         ipa = Path("/tmp/1.44.1/IPA.exe")
         proton = Path("/tmp/proton")
         self.assertEqual(
             build_bootstrap_command(ipa, proton=proton, native=False),
-            [str(proton), "run", str(ipa), "-n"],
+            [str(proton), "run", str(ipa), str(ipa.with_name("Beat Saber.exe")), "-n"],
         )
 
     def test_profile_config_resolves_windows_paths(self) -> None: