diff --git a/src/jobs.hpp b/src/jobs.hpp
index 162a7c1..b881589 100644
--- a/src/jobs.hpp
+++ b/src/jobs.hpp
@@ -27,7 +27,7 @@ class KggTask {
     void info(const wchar_t* msg) const { fwprintf(stderr, L"[INFO] %s (%s)\n", msg, kgg_path_.filename().c_str()); }
     void info(const std::wstring& msg) const { info(msg.c_str()); }
 
-    void Execute(const Infra::kgm_ekey_db_t& ekey_db) const {
+    void Execute(const Infra::kgm_ekey_db_t& ekey_db, const std::wstring_view suffix) const {
         constexpr static std::array<uint8_t, 16> kMagicHeader{0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
                                                               0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14};
 
@@ -70,7 +70,7 @@ class KggTask {
         kgg_stream_in.read(magic.data(), 4);
         qmc2->Decrypt(std::span(reinterpret_cast<uint8_t*>(magic.data()), 4), 0);
         auto real_ext = DetectRealExt(magic);
-        auto out_path = out_dir_ / std::format(L"{}_kgg-dec.{}", kgg_path_.stem().wstring(), real_ext);
+        auto out_path = out_dir_ / std::format(L"{}{}.{}", kgg_path_.stem().wstring(), suffix, real_ext);
 
         if (exists(out_path)) {
             warning(std::format(L"output file already exists: {}", out_path.filename().wstring()));
@@ -117,7 +117,8 @@ class KggTask {
 
 class KggTaskQueue {
    public:
-    explicit KggTaskQueue(Infra::kgm_ekey_db_t ekey_db) : ekey_db_(std::move(ekey_db)) {}
+    explicit KggTaskQueue(Infra::kgm_ekey_db_t ekey_db, const std::wstring_view suffix)
+        : ekey_db_(std::move(ekey_db)), suffix_(suffix) {}
 
     void Push(std::unique_ptr<KggTask> task) {
         std::lock_guard lock(mutex_);
@@ -160,12 +161,13 @@ class KggTaskQueue {
    private:
     bool thread_end_{false};
     Infra::kgm_ekey_db_t ekey_db_;
+    std::wstring suffix_;
     void WorkerThreadBody() {
         SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
 
         std::unique_ptr<KggTask> task{nullptr};
         while ((task = Pop())) {
-            task->Execute(ekey_db_);
+            task->Execute(ekey_db_, suffix_);
         }
     }
 
diff --git a/src/main.cpp b/src/main.cpp
index 150fee4..c8f2bca 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -103,7 +103,7 @@ int main() {
     }
 #endif
 
-    KggTaskQueue queue(ekey_db);
+    KggTaskQueue queue(ekey_db, file_suffix);
     auto thread_count =
 #ifndef NDEBUG
         1;