diff --git a/app/native/wndb/inp_in.py b/app/native/wndb/inp_in.py
index 183202e..a283f93 100644
--- a/app/native/wndb/inp_in.py
+++ b/app/native/wndb/inp_in.py
@@ -161,7 +161,7 @@ def _get_file_offset(inp: str) -> tuple[dict[str, list[int]], bool]:
     current = ""
     demand_outside = False
 
-    with open(inp) as f:
+    with open(inp, encoding="utf-8") as f:
         while True:
             line = f.readline()
             if not line:
@@ -210,7 +210,7 @@ def parse_file(project: str, inp: str, version: str = "3") -> None:
 
     sql_batch = SQLBatch(project)
     _print_time("Second scan...")
-    with open(inp) as f:
+    with open(inp, encoding="utf-8") as f:
         for s in levels:
             if s not in offset:
                 continue
@@ -421,7 +421,7 @@ def convert_inp_v3_to_v2(inp: str) -> ChangeSet:
     if os.path.exists(filename):
         os.remove(filename)
 
-    with open(filename, "w") as f:
+    with open(filename, "w", encoding="utf-8") as f:
         f.write(inp)
 
     parse_file(project, filename, "3")
@@ -448,7 +448,7 @@ def import_inp(project: str, cs: ChangeSet, version: str = "3") -> bool:
         os.remove(filename)
 
     _print_time(f'Start writing temp file "{filename}"...')
-    with open(filename, "w", encoding="GBK") as f:
+    with open(filename, "w", encoding="utf-8") as f:
         f.write(str(cs.operations[0]["inp"]))
     _print_time(f'End writing temp file "{filename}"...')