diff --git a/angelica.py b/angelica.py
index 38bf054..f8b2b28 100644
--- a/angelica.py
+++ b/angelica.py
@@ -116,7 +116,7 @@ def get_game_install_dir(dir_path, target_app_id):
     # acfファイルにある"installdir" "xxxx"をさがす
     install_dir_pattern = re.compile(r'\s*"installdir"\s+"(.*)')
     game_install_dir_name = None
-    with open(target_app_acf_path, mode='r', encoding="utf8") as target_app_acf_file:
+    with open(target_app_acf_path, mode='r', encoding="utf8", errors='ignore') as target_app_acf_file:
         for line in target_app_acf_file:
             result = install_dir_pattern.match(line)
             if result is not None:
@@ -144,7 +144,7 @@ def get_lib_folders_from_vdf(steam_apps_path):
     # vdfファイルにある"[数字]" "xxxx"をさがす
     install_dir_pattern = re.compile(r'\s*"[0-9]+"\s+"(.*)')
     game_libs_paths = []
-    with open(library_folders_vdf_path, mode='r', encoding="utf8") as target_vdf_file:
+    with open(library_folders_vdf_path, mode='r', encoding="utf8", errors='ignore') as target_vdf_file:
         for line in target_vdf_file:
             result = install_dir_pattern.match(line)
             if result is not None:
@@ -154,7 +154,7 @@ def get_lib_folders_from_vdf(steam_apps_path):
 
 
 def install_key_file(save_file_path, mod_title, key_file_path):
-    with open(save_file_path, encoding="utf-8", mode='w') as fw:
+    with open(save_file_path, encoding="utf-8", mode='w', errors='ignore') as fw:
         fw.write("\n".join([
             mod_title,
             key_file_path
diff --git a/github_tool.py b/github_tool.py
index 7a99c01..2d80383 100644
--- a/github_tool.py
+++ b/github_tool.py
@@ -46,7 +46,7 @@ def download_asset_from_github(repository_author,
 
     req = urllib.request.Request(request_url)
 
-    with open(out_file_path, "wb") as my_file:
+    with open(out_file_path, "wb", errors='ignore') as my_file:
         my_file.write(urllib.request.urlopen(req).read())
 
     return out_file_path