diff --git a/openrct2.vcxproj b/openrct2.vcxproj
index db48dcb07b..67e10db96b 100644
--- a/openrct2.vcxproj
+++ b/openrct2.vcxproj
@@ -88,6 +88,7 @@
+
@@ -422,6 +423,7 @@
+
diff --git a/src/FileClassifier.cpp b/src/FileClassifier.cpp
new file mode 100644
index 0000000000..f3b122aae9
--- /dev/null
+++ b/src/FileClassifier.cpp
@@ -0,0 +1,175 @@
+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+ * For more information, visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * A full copy of the GNU General Public License can be found in licence.txt
+ *****************************************************************************/
+#pragma endregion
+
+#include "core/FileStream.hpp"
+#include "FileClassifier.h"
+
+extern "C"
+{
+ #include "scenario/scenario.h"
+ #include "util/sawyercoding.h"
+}
+
+static bool TryClassifyAsS6(IStream * stream, ClassifiedFile * result);
+static bool TryClassifyAsS4(IStream * stream, ClassifiedFile * result);
+static bool TryClassifyAsTD4_TD6(IStream * stream, ClassifiedFile * result);
+static bool sawyercoding_try_read_chunk(void * dst, size_t expectedSize, IStream * stream);
+
+bool TryClassifyFile(const std::string &path, ClassifiedFile * result)
+{
+ try
+ {
+ auto fs = FileStream(path, FILE_MODE_OPEN);
+ return TryClassifyFile(&fs, result);
+ }
+ catch (Exception)
+ {
+ return false;
+ }
+}
+
+bool TryClassifyFile(IStream * stream, ClassifiedFile * result)
+{
+ // TODO Currently track designs get classified as SC4s because they use the
+ // same checksum algorithm. The only way after to tell the difference
+ // between them is to decode it. Decoding however is currently not protected
+ // against invalid compression data for that decoding algorithm and will crash.
+
+ // S6 detection
+ if (TryClassifyAsS6(stream, result))
+ {
+ return true;
+ }
+
+ // S4 detection
+ if (TryClassifyAsS4(stream, result))
+ {
+ return true;
+ }
+
+ // TD6 detection
+ if (TryClassifyAsTD4_TD6(stream, result))
+ {
+ return true;
+ }
+
+ return false;
+}
+
+static bool TryClassifyAsS6(IStream * stream, ClassifiedFile * result)
+{
+ rct_s6_header s6Header;
+ if (sawyercoding_try_read_chunk(&s6Header, sizeof(rct_s6_header), stream))
+ {
+ if (s6Header.type == S6_TYPE_SAVEDGAME)
+ {
+ result->Type = FILE_TYPE::SAVED_GAME;
+ }
+ else if (s6Header.type == S6_TYPE_SCENARIO)
+ {
+ result->Type = FILE_TYPE::SCENARIO;
+ }
+ result->Version = s6Header.version;
+ return true;
+ }
+
+ return false;
+}
+
+static bool TryClassifyAsS4(IStream * stream, ClassifiedFile * result)
+{
+ uint64 originalPosition = stream->GetPosition();
+ size_t dataLength = (size_t)stream->GetLength();
+ uint8 * data = stream->ReadArray(dataLength);
+ stream->SetPosition(originalPosition);
+ int fileTypeVersion = sawyercoding_detect_file_type(data, dataLength);
+ Memory::Free(data);
+
+ int type = fileTypeVersion & FILE_TYPE_MASK;
+ int version = fileTypeVersion & FILE_VERSION_MASK;
+
+ if (type == FILE_TYPE_SV4)
+ {
+ result->Type = FILE_TYPE::SAVED_GAME;
+ result->Version = version;
+ return true;
+ }
+ else if (type == FILE_TYPE_SC4)
+ {
+ result->Type = FILE_TYPE::SCENARIO;
+ result->Version = version;
+ return true;
+ }
+
+ return false;
+}
+
+static bool TryClassifyAsTD4_TD6(IStream * stream, ClassifiedFile * result)
+{
+ bool success = false;
+ uint64 originalPosition = stream->GetPosition();
+ size_t dataLength = (size_t)stream->GetLength();
+ uint8 * data = stream->ReadArray(dataLength);
+ stream->SetPosition(originalPosition);
+
+ if (sawyercoding_validate_track_checksum(data, dataLength))
+ {
+ uint8 * td6data = Memory::Allocate(0x10000);
+ size_t td6len = sawyercoding_decode_td6(data, td6data, dataLength);
+ if (td6data != nullptr && td6len >= 8)
+ {
+ uint8 version = (td6data[7] >> 2) & 3;
+ if (version <= 2)
+ {
+ result->Type = FILE_TYPE::TRACK_DESIGN;
+ result->Version = version;
+ success = true;
+ }
+ }
+ Memory::Free(td6data);
+ }
+ Memory::Free(data);
+
+ return success;
+}
+
+static bool sawyercoding_try_read_chunk(void * dst, size_t expectedSize, IStream * stream)
+{
+ uint64 originalPosition = stream->GetPosition();
+
+ bool success = false;
+ auto header = stream->ReadValue();
+ switch (header.encoding) {
+ case CHUNK_ENCODING_NONE:
+ case CHUNK_ENCODING_RLE:
+ case CHUNK_ENCODING_RLECOMPRESSED:
+ case CHUNK_ENCODING_ROTATE:
+ uint8 * compressedData = Memory::Allocate(header.length);
+ if (stream->TryRead(compressedData, header.length) == header.length)
+ {
+ size_t uncompressedLength = sawyercoding_read_chunk_buffer((uint8 *)dst, compressedData, header, expectedSize);
+ if (uncompressedLength == expectedSize)
+ {
+ success = true;
+ }
+ }
+ Memory::Free(compressedData);
+ break;
+ }
+
+ stream->SetPosition(originalPosition);
+ return success;
+}
diff --git a/src/FileClassifier.h b/src/FileClassifier.h
new file mode 100644
index 0000000000..daefcc5537
--- /dev/null
+++ b/src/FileClassifier.h
@@ -0,0 +1,40 @@
+#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
+/*****************************************************************************
+ * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
+ *
+ * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
+ * For more information, visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * A full copy of the GNU General Public License can be found in licence.txt
+ *****************************************************************************/
+#pragma endregion
+
+#pragma once
+
+#include
+#include "common.h"
+
+interface IStream;
+
+enum class FILE_TYPE
+{
+ UNDEFINED,
+ OBJECT,
+ SAVED_GAME,
+ SCENARIO,
+ TRACK_DESIGN,
+};
+
+struct ClassifiedFile
+{
+ FILE_TYPE Type;
+ uint32 Version;
+};
+
+bool TryClassifyFile(const std::string &path, ClassifiedFile * result);
+bool TryClassifyFile(IStream * stream, ClassifiedFile * result);