diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d7aacd71..f2ff95b8 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -63,7 +63,10 @@ jobs:
       - name: Build Windows
         if: matrix.os == 'windows'
         env:
-          RUSTFLAGS: -Clto=fat -Cembed-bitcode=true -Clinker=lld-link
+          MOZ_LTO: full
+          CFLAGS: /clang:-flto
+          CPPFLAGS: " /clang:-flto"
+          RUSTFLAGS: -Clinker-plugin-lto -Clinker=lld-link
         run: |
           just build-release -v --target $env:TARGET
           Rename-Item -Path .\target\$env:TARGET\release\cli.exe -NewName spiderfire.exe
@@ -78,8 +81,9 @@ jobs:
         if: matrix.os == 'linux'
         env:
           MOZ_LTO: full
-          CFLAGS: -flto -fuse-ld=lld
-          CXXFLAGS: -flto -fuse-ld=lld
+          CFLAGS: -flto
+          CPPFLAGS: -flto
+          CXXFLAGS: -flto
           LDFLAGS: -fuse-ld=lld
           RUSTFLAGS: -Clinker-plugin-lto -Clinker=clang -Clink-arg=-fuse-ld=lld
         run: |
diff --git a/modules/src/fs/fs.rs b/modules/src/fs/fs.rs
index 5f66da07..5ca32018 100644
--- a/modules/src/fs/fs.rs
+++ b/modules/src/fs/fs.rs
@@ -20,38 +20,38 @@ use runtime::promise::future_to_promise;
 
 fn check_exists(path: &Path) -> Result<()> {
 	if path.exists() {
+		Ok(())
+	} else {
 		Err(Error::new(
 			format!("Path {} does not exist", path.to_str().unwrap()),
 			None,
 		))
-	} else {
-		Ok(())
 	}
 }
 
 fn check_not_exists(path: &Path) -> Result<()> {
 	if !path.exists() {
-		Err(Error::new(format!("Path {} exist", path.to_str().unwrap()), None))
-	} else {
 		Ok(())
+	} else {
+		Err(Error::new(format!("Path {} exists", path.to_str().unwrap()), None))
 	}
 }
 
 fn check_is_file(path: &Path) -> Result<()> {
 	check_exists(path)?;
 	if path.is_file() {
+		Ok(())
+	} else {
 		Err(Error::new(
 			format!("Path {} is not a file", path.to_str().unwrap()),
 			None,
 		))
-	} else {
-		Ok(())
 	}
 }
 
 fn check_is_not_file(path: &Path) -> Result<()> {
 	check_exists(path)?;
-	if !path.is_file() {
+	if path.is_file() {
 		Err(Error::new(format!("Path {} is a file", path.to_str().unwrap()), None))
 	} else {
 		Ok(())
@@ -61,18 +61,18 @@ fn check_is_not_file(path: &Path) -> Result<()> {
 fn check_is_dir(path: &Path) -> Result<()> {
 	check_exists(path)?;
 	if path.is_dir() {
+		Ok(())
+	} else {
 		Err(Error::new(
 			format!("Path {} is not a directory", path.to_str().unwrap()),
 			None,
 		))
-	} else {
-		Ok(())
 	}
 }
 
 fn check_is_not_dir(path: &Path) -> Result<()> {
 	check_exists(path)?;
-	if !path.is_dir() {
+	if path.is_dir() {
 		Err(Error::new(
 			format!("Path {} is a directory", path.to_str().unwrap()),
 			None,