diff --git a/unreal_cpp_bootstrapper/build.rs b/unreal_cpp_bootstrapper/build.rs
index e8e82502..a8a06120 100644
--- a/unreal_cpp_bootstrapper/build.rs
+++ b/unreal_cpp_bootstrapper/build.rs
@@ -86,6 +86,7 @@ fn download(mod_loader_dir: &PathBuf) -> Result<(PathBuf, PathBuf), Box<dyn Erro
         .write(true)
         .read(true)
         .create(true)
+        .truncate(true)
         .open(&loader_file_path)?;
     loader_asset.download(&mut loader_file)?;
 
@@ -93,6 +94,7 @@ fn download(mod_loader_dir: &PathBuf) -> Result<(PathBuf, PathBuf), Box<dyn Erro
         .write(true)
         .read(true)
         .create(true)
+        .truncate(true)
         .open(&proxy_file_path)?;
     proxy_asset.download(&mut proxy_file)?;
 
diff --git a/unreal_cpp_bootstrapper/src/lib.rs b/unreal_cpp_bootstrapper/src/lib.rs
index 2b580955..1125f1ad 100644
--- a/unreal_cpp_bootstrapper/src/lib.rs
+++ b/unreal_cpp_bootstrapper/src/lib.rs
@@ -60,6 +60,7 @@ pub fn bootstrap(
             let mut file = OpenOptions::new()
                 .create(true)
                 .write(true)
+                .truncate(true)
                 .read(true)
                 .open(path)?;
 
diff --git a/unreal_mod_manager/src/game_platform_managers/proton.rs b/unreal_mod_manager/src/game_platform_managers/proton.rs
index 70d2a5d6..88942950 100644
--- a/unreal_mod_manager/src/game_platform_managers/proton.rs
+++ b/unreal_mod_manager/src/game_platform_managers/proton.rs
@@ -105,6 +105,7 @@ impl unreal_cpp_bootstrapper::CppLoaderInstallExtension<ModLoaderWarning> for Pr
         let file = std::fs::OpenOptions::new()
             .create(true)
             .write(true)
+            .truncate(true)
             .open(registry_path)?;
 
         let mut writer = std::io::BufWriter::new(file);