diff --git a/.gitignore b/.gitignore
index 60784fe..ee95e39 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,5 @@ bin
 *.lnk
 *.exe
 *.bat
+
+.sw
diff --git a/src/common/buffer.cpp b/src/common/buffer.cpp
index e4743f8..c1140fb 100644
--- a/src/common/buffer.cpp
+++ b/src/common/buffer.cpp
@@ -157,6 +157,7 @@ void buffer::reset() const
 {
     index_ = 0;
     data_offset = 0;
+    if (buf_)
     ptr = (uint8_t *)buf_->data();
 }
 
diff --git a/src/mmm_extractor/mmm_extractor.cpp b/src/mmm_extractor/mmm_extractor.cpp
index d7064db..0af9081 100644
--- a/src/mmm_extractor/mmm_extractor.cpp
+++ b/src/mmm_extractor/mmm_extractor.cpp
@@ -46,7 +46,7 @@ struct mmm
 
 mmm read_mmm(const path &fn)
 {
-    buffer b(read_file(fn, true));
+    buffer b(read_file(fn));
     mmm m;
     m.load(b);
 
diff --git a/src/mmp_extractor/mmp.cpp b/src/mmp_extractor/mmp.cpp
index edcbdbe..fe65c2b 100644
--- a/src/mmp_extractor/mmp.cpp
+++ b/src/mmp_extractor/mmp.cpp
@@ -147,8 +147,8 @@ void mmp::process()
             textures[i.getTexture()]++;
     }
     textures.erase(0);
-    auto textures_per_color = std::max(1U, textures.size() / 3);
-    auto color_step = 200 / std::max(1U, textures.size());
+    auto textures_per_color = std::max<size_t>(1U, textures.size() / 3);
+    auto color_step = 200 / std::max<size_t>(1U, textures.size());
     for (size_t i = 0; i < textures.size(); i++)
     {
         int color_id = i / textures_per_color;
diff --git a/src/unpaker/pak.cpp b/src/unpaker/pak.cpp
index ca4dae2..a2769bb 100644
--- a/src/unpaker/pak.cpp
+++ b/src/unpaker/pak.cpp
@@ -105,12 +105,12 @@ void segment::load_segment()
     auto f = file;
 
     fseek(f, offset, SEEK_SET);
-    if (algorithm == 0)
+    /*if (algorithm == 0)
     {
         std::cerr << "Something is wrong. Maybe you trying to open aim2 files?\n";
         std::cerr << "They can be opened with SDK extractor.\n";
         throw std::runtime_error("error");
-    }
+    }*/
 
     FREAD(size1);
     size2 = size1;
@@ -163,6 +163,8 @@ void segment::decompress(int segment_id)
             decode_rle((char*)encoded, size1, (char*)decoded);
         }
     }
+    if (algorithm == None)
+        decoded = encoded;
 }
 
 void pak::load(FILE *f)
diff --git a/src/unpaker/pak.h b/src/unpaker/pak.h
index 15d9217..db08a27 100644
--- a/src/unpaker/pak.h
+++ b/src/unpaker/pak.h
@@ -57,6 +57,7 @@ struct segment
 {
     enum decode_algorithm : uint32_t
     {
+        None = 0x0,
         RLE_2_bytes = 0x1,
         RLE_1_byte  = 0x2,
         DA_1 = 0x4,
diff --git a/src/unpaker/unpaker.cpp b/src/unpaker/unpaker.cpp
index d1f48fa..7be1b05 100644
--- a/src/unpaker/unpaker.cpp
+++ b/src/unpaker/unpaker.cpp
@@ -36,10 +36,8 @@ void unpak(string fn)
         file.write(fn + ".dir", buf);
     };
 
-    unpack(p.files["arena.mmp"]);
-
-    //for (auto &[n,f] : p.files)
-        //unpack(f);
+    for (auto &[n,f] : p.files)
+        unpack(f);
     fclose(f);
 }
 
diff --git a/sw.cpp b/sw.cpp
new file mode 100644
index 0000000..d06c256
--- /dev/null
+++ b/sw.cpp
@@ -0,0 +1,71 @@
+#pragma sw require header org.sw.demo.lexxmark.winflexbison.bison-master
+
+void build(Solution &s)
+{
+    auto &tools = s.addProject("Polygon4.Tools", "master");
+
+    auto &common = tools.addStaticLibrary("common");
+    common.CPPVersion = CPPLanguageStandard::CPP17;
+    common.setRootDirectory("src/common");
+    common.Public += "pub.egorpugin.primitives.filesystem-master"_dep;
+    common.Public += "pub.egorpugin.primitives.sw.main-master"_dep;
+
+    auto add_exe = [&tools](const String &name) -> decltype(auto)
+    {
+        auto &t = tools.addExecutable(name);
+        t.CPPVersion = CPPLanguageStandard::CPP17;
+        t.setRootDirectory("src/" + name);
+        return t;
+    };
+
+    auto add_exe_with_common = [&add_exe, &common](const String &name) -> decltype(auto)
+    {
+        auto &t = add_exe(name);
+        t.Public += common;
+        return t;
+    };
+
+    auto add_exe_with_data_manager = [&add_exe_with_common](const String &name) -> decltype(auto)
+    {
+        auto &t = add_exe_with_common(name);
+        t.Public += "pub.lzwdgc.Polygon4.DataManager-master"_dep;
+        return t;
+    };
+
+    add_exe_with_data_manager("db_add_language") += "pub.egorpugin.primitives.executor-master"_dep;
+    add_exe_with_data_manager("db_extractor");
+    add_exe_with_data_manager("mmm_extractor");
+    add_exe_with_data_manager("mmo_extractor");
+    add_exe_with_common("mmp_extractor") += "org.sw.demo.intel.opencv.highgui-*"_dep;
+    add_exe_with_common("mpj_loader");
+    add_exe_with_common("tm_converter");
+    add_exe("name_generator");
+    add_exe_with_common("save_loader");
+    add_exe("unpaker");
+
+    // not so simple targets
+    auto &script2txt = tools.addStaticLibrary("script2txt");
+    script2txt.CPPVersion = CPPLanguageStandard::CPP17;
+    script2txt.setRootDirectory("src/script2txt");
+    script2txt += "pub.lzwdgc.Polygon4.DataManager.schema-master"_dep;
+    gen_flex_bison_pair(script2txt, "LALR1_CPP_VARIANT_PARSER", "script2txt");
+
+    auto &model = tools.addStaticLibrary("model");
+    model.CPPVersion = CPPLanguageStandard::CPP17;
+    model.setRootDirectory("src/model");
+    model.Public += common, "org.sw.demo.unicode.icu.i18n-*"_dep;
+
+    add_exe("mod_reader") += model;
+
+    auto &mod_converter = add_exe("mod_converter");
+    mod_converter += model;
+    path sdk = "d:/arh/apps/Autodesk/FBX/FBX SDK/2019.0";
+    mod_converter += IncludeDirectory(sdk / "include");
+    String cfg = "release";
+    if (s.Settings.Native.ConfigurationType == ConfigurationType::Debug)
+        cfg = "debug";
+    String arch = "x64";
+    if (s.Settings.TargetOS.Arch == ArchType::x86)
+        arch = "x86";
+    mod_converter += LinkLibrary(sdk / ("lib/vs2015/" + arch + "/" + cfg + "/libfbxsdk-md.lib"));
+}