diff --git a/data/language/en-GB.txt b/data/language/en-GB.txt
index 69a8b73ebd..1d7db9c279 100644
--- a/data/language/en-GB.txt
+++ b/data/language/en-GB.txt
@@ -3496,8 +3496,8 @@ STR_6386    :Blizzard
 STR_6387    :Can’t lower element here…
 STR_6388    :Can’t raise element here…
 STR_6389    :Invalid clearance
-STR_6390    :OpenRCT2 needs files from the original RollerCoaster Tycoon 2 in order to work. Please select the directory where you installed RollerCoaster Tycoon 2.
-STR_6391    :Please select your RCT2 directory
+STR_6390    :OpenRCT2 needs files from the original RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic in order to work. Please select the directory where you installed RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic.
+STR_6391    :Please select your RCT2 or RCTC directory
 STR_6392    :Could not find {STRING} at this path.
 STR_6393    :Objective Selection
 STR_6394    :Objective
@@ -3505,9 +3505,9 @@ STR_6395    :Maintenance
 STR_6396    :Disable screensaver and monitor power saving
 STR_6397    :If checked, screensaver and other monitor power saving features will be inhibited while OpenRCT2 is running.
 STR_6398    :File contains unsupported ride types. Please update to a newer version of OpenRCT2.
-STR_6399    :OpenRCT2 needs files from the original RollerCoaster Tycoon 2 in order to work. Please set the “game_path” variable in config.ini to the directory where you installed RollerCoaster Tycoon 2, then restart OpenRCT2.
+STR_6399    :OpenRCT2 needs files from the original RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic in order to work. Please set the “game_path” variable in config.ini to the directory where you installed RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic, then restart OpenRCT2.
 STR_6400    :I have the GOG offline installer for RollerCoaster Tycoon 2 downloaded, but it is not installed
-STR_6401    :I have RollerCoaster Tycoon 2 installed already
+STR_6401    :I have RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic installed already
 STR_6402    :OpenRCT2 Data Setup
 STR_6403    :Select which applies best to you
 STR_6404    :Please select the GOG RollerCoaster Tycoon 2 installer.
diff --git a/distribution/changelog.txt b/distribution/changelog.txt
index ea2d89364e..4139369402 100644
--- a/distribution/changelog.txt
+++ b/distribution/changelog.txt
@@ -8,6 +8,7 @@
 - Feature: [#17638] Added Zero G rolls, medium loops and large corkscrews to the Hybrid and Single-Rail coasters.
 - Feature: [#17877] Add three real-life flying roller coaster colour schemes.
 - Feature: [#17900] Add “Classic Wooden Coaster” with shallow banked turns.
+- Feature: [#17929] Fully support RollerCoaster Tycoon Classic as a RCT2 base install path.
 - Feature: [objects#198] Add additional pirate roofs.
 - Improved: [#15358] Park and scenario names can now contain up to 128 characters.
 - Improved: [#16840] Add support for rectangular heightmaps.
diff --git a/distribution/linux/openrct2.appdata.xml b/distribution/linux/openrct2.appdata.xml
index 990b9f3799..24dde734ef 100644
--- a/distribution/linux/openrct2.appdata.xml
+++ b/distribution/linux/openrct2.appdata.xml
@@ -30,7 +30,7 @@
       <li>Auto-saving and giant screenshots.</li>
     </ul>
     <p>
-      Original RollerCoaster Tycoon 2 game files are required in order to play OpenRCT2.
+      Original RollerCoaster Tycoon 2 or RollerCoaster Tycoon Classic game files are required in order to play OpenRCT2.
     </p>
   </description>
   <screenshots>
diff --git a/src/openrct2/PlatformEnvironment.cpp b/src/openrct2/PlatformEnvironment.cpp
index 6e42dd791b..801773d96a 100644
--- a/src/openrct2/PlatformEnvironment.cpp
+++ b/src/openrct2/PlatformEnvironment.cpp
@@ -22,6 +22,7 @@ class PlatformEnvironment final : public IPlatformEnvironment
 {
 private:
     u8string _basePath[DIRBASE_COUNT];
+    bool _usingRctClassic{};
 
 public:
     explicit PlatformEnvironment(DIRBASE_VALUES basePaths)
@@ -45,9 +46,11 @@ public:
         {
             default:
             case DIRBASE::RCT1:
-            case DIRBASE::RCT2:
                 directoryName = DirectoryNamesRCT2[static_cast<size_t>(did)];
                 break;
+            case DIRBASE::RCT2:
+                directoryName = _usingRctClassic ? "Assets" : DirectoryNamesRCT2[static_cast<size_t>(did)];
+                break;
             case DIRBASE::OPENRCT2:
             case DIRBASE::USER:
             case DIRBASE::CONFIG:
@@ -69,6 +72,19 @@ public:
     u8string FindFile(DIRBASE base, DIRID did, u8string_view fileName) const override
     {
         auto dataPath = GetDirectoryPath(base, did);
+
+        std::string alternativeFilename;
+        if (_usingRctClassic && base == DIRBASE::RCT2 && did == DIRID::DATA)
+        {
+            // Special case, handle RCT Classic css ogg files
+            if (String::StartsWith(fileName, "css", true) && String::EndsWith(fileName, ".dat", true))
+            {
+                alternativeFilename = fileName.substr(0, fileName.size() - 3);
+                alternativeFilename.append("ogg");
+                fileName = alternativeFilename;
+            }
+        }
+
         auto path = Path::ResolveCasing(Path::Combine(dataPath, fileName));
         if (base == DIRBASE::RCT1 && did == DIRID::DATA && !File::Exists(path))
         {
@@ -80,12 +96,23 @@ public:
                 path = alternativePath;
             }
         }
+
         return path;
     }
 
     void SetBasePath(DIRBASE base, u8string_view path) override
     {
         _basePath[static_cast<size_t>(base)] = path;
+
+        if (base == DIRBASE::RCT2)
+        {
+            _usingRctClassic = Platform::IsRCTClassicPath(path);
+        }
+    }
+
+    bool IsUsingClassic() const override
+    {
+        return _usingRctClassic;
     }
 
 private:
diff --git a/src/openrct2/PlatformEnvironment.h b/src/openrct2/PlatformEnvironment.h
index 58a68deb92..8d97ca9ddd 100644
--- a/src/openrct2/PlatformEnvironment.h
+++ b/src/openrct2/PlatformEnvironment.h
@@ -83,6 +83,7 @@ namespace OpenRCT2
         virtual u8string GetFilePath(PATHID pathid) const abstract;
         virtual u8string FindFile(DIRBASE base, DIRID did, u8string_view fileName) const abstract;
         virtual void SetBasePath(DIRBASE base, u8string_view path) abstract;
+        virtual bool IsUsingClassic() const abstract;
     };
 
     [[nodiscard]] std::unique_ptr<IPlatformEnvironment> CreatePlatformEnvironment(DIRBASE_VALUES basePaths);
diff --git a/src/openrct2/audio/Audio.cpp b/src/openrct2/audio/Audio.cpp
index 4cd5adcafd..ca6933996a 100644
--- a/src/openrct2/audio/Audio.cpp
+++ b/src/openrct2/audio/Audio.cpp
@@ -12,6 +12,7 @@
 #include "../Context.h"
 #include "../Intro.h"
 #include "../OpenRCT2.h"
+#include "../PlatformEnvironment.h"
 #include "../config/Config.h"
 #include "../core/File.h"
 #include "../core/FileStream.h"
@@ -98,11 +99,31 @@ namespace OpenRCT2::Audio
     void LoadAudioObjects()
     {
         auto& objManager = GetContext()->GetObjectManager();
-        auto* baseAudio = objManager.LoadObject(AudioObjectIdentifiers::Rct2Base);
-        if (baseAudio != nullptr)
+
+        Object* baseAudio{};
+
+        // We have a different audio object for RCT Classic
+        auto env = GetContext()->GetPlatformEnvironment();
+        if (env->IsUsingClassic())
         {
-            _soundsAudioObjectEntryIndex = objManager.GetLoadedObjectEntryIndex(baseAudio);
+            baseAudio = objManager.LoadObject(AudioObjectIdentifiers::Rct2cBase);
+            if (baseAudio != nullptr)
+            {
+                baseAudio->SetIdentifier(AudioObjectIdentifiers::Rct2Base);
+                _soundsAudioObjectEntryIndex = objManager.GetLoadedObjectEntryIndex(baseAudio);
+            }
         }
+
+        if (baseAudio == nullptr)
+        {
+            // Fallback to vanilla RCT2 audio object
+            baseAudio = objManager.LoadObject(AudioObjectIdentifiers::Rct2Base);
+            if (baseAudio != nullptr)
+            {
+                _soundsAudioObjectEntryIndex = objManager.GetLoadedObjectEntryIndex(baseAudio);
+            }
+        }
+
         objManager.LoadObject(AudioObjectIdentifiers::Rct2Circus);
     }
 
diff --git a/src/openrct2/audio/audio.h b/src/openrct2/audio/audio.h
index 302e51b98a..bf6ce96575 100644
--- a/src/openrct2/audio/audio.h
+++ b/src/openrct2/audio/audio.h
@@ -137,6 +137,7 @@ namespace OpenRCT2::Audio
     {
         constexpr std::string_view Rct1Title = "rct1.audio.title";
         constexpr std::string_view Rct2Base = "rct2.audio.base";
+        constexpr std::string_view Rct2cBase = "rct2.audio.base.rctc";
         constexpr std::string_view Rct2Title = "rct2.audio.title";
         constexpr std::string_view Rct2Circus = "rct2.audio.circus";
     } // namespace AudioObjectIdentifiers
diff --git a/src/openrct2/drawing/Drawing.Sprite.cpp b/src/openrct2/drawing/Drawing.Sprite.cpp
index 1c30498000..f9673ea1a0 100644
--- a/src/openrct2/drawing/Drawing.Sprite.cpp
+++ b/src/openrct2/drawing/Drawing.Sprite.cpp
@@ -199,7 +199,7 @@ bool gfx_load_g1(const IPlatformEnvironment& env)
     log_verbose("gfx_load_g1(...)");
     try
     {
-        auto path = Path::Combine(env.GetDirectoryPath(DIRBASE::RCT2, DIRID::DATA), u8"g1.dat");
+        auto path = env.FindFile(DIRBASE::RCT2, DIRID::DATA, u8"g1.dat");
         auto fs = FileStream(path, FILE_MODE_OPEN);
         _g1.header = fs.ReadValue<rct_g1_header>();
 
diff --git a/src/openrct2/object/MusicObject.cpp b/src/openrct2/object/MusicObject.cpp
index c0e9ef215d..fd76562abe 100644
--- a/src/openrct2/object/MusicObject.cpp
+++ b/src/openrct2/object/MusicObject.cpp
@@ -185,9 +185,8 @@ ObjectAsset MusicObject::GetAsset(IReadObjectContext& context, std::string_view
 {
     if (path.find("$RCT2:DATA/") == 0)
     {
-        auto platformEnvironment = GetContext()->GetPlatformEnvironment();
-        auto dir = platformEnvironment->GetDirectoryPath(DIRBASE::RCT2, DIRID::DATA);
-        auto path2 = Path::Combine(dir, std::string(path.substr(11)));
+        auto env = GetContext()->GetPlatformEnvironment();
+        auto path2 = env->FindFile(DIRBASE::RCT2, DIRID::DATA, path.substr(11));
         return ObjectAsset(path2);
     }
 
diff --git a/src/openrct2/object/ObjectFactory.cpp b/src/openrct2/object/ObjectFactory.cpp
index 76f21d88bf..cd7f99be58 100644
--- a/src/openrct2/object/ObjectFactory.cpp
+++ b/src/openrct2/object/ObjectFactory.cpp
@@ -502,7 +502,10 @@ namespace ObjectFactory
     std::unique_ptr<Object> CreateObjectFromJson(
         IObjectRepository& objectRepository, json_t& jRoot, const IFileDataRetriever* fileRetriever, bool loadImageTable)
     {
-        Guard::Assert(jRoot.is_object(), "ObjectFactory::CreateObjectFromJson expects parameter jRoot to be object");
+        if (!jRoot.is_object())
+        {
+            throw std::runtime_error("Object JSON root was not an object");
+        }
 
         log_verbose("CreateObjectFromJson(...)");
 
diff --git a/src/openrct2/platform/Platform.h b/src/openrct2/platform/Platform.h
index 0a827fcd7d..a2071e882d 100644
--- a/src/openrct2/platform/Platform.h
+++ b/src/openrct2/platform/Platform.h
@@ -87,6 +87,8 @@ namespace Platform
     bool ProcessIsElevated();
     float GetDefaultScale();
 
+    bool IsRCT2Path(std::string_view path);
+    bool IsRCTClassicPath(std::string_view path);
     bool OriginalGameDataExists(std::string_view path);
 
     std::string GetUsername();
diff --git a/src/openrct2/platform/Shared.cpp b/src/openrct2/platform/Shared.cpp
index e64f0ca90d..25bddf8375 100644
--- a/src/openrct2/platform/Shared.cpp
+++ b/src/openrct2/platform/Shared.cpp
@@ -94,10 +94,21 @@ namespace Platform
         return outTime;
     }
 
+    bool IsRCT2Path(std::string_view path)
+    {
+        auto combinedPath = Path::ResolveCasing(Path::Combine(path, u8"Data", u8"g1.dat"));
+        return File::Exists(combinedPath);
+    }
+
+    bool IsRCTClassicPath(std::string_view path)
+    {
+        auto combinedPath = Path::ResolveCasing(Path::Combine(path, u8"Assets", u8"g1.dat"));
+        return File::Exists(combinedPath);
+    }
+
     bool OriginalGameDataExists(std::string_view path)
     {
-        std::string combinedPath = Path::ResolveCasing(Path::Combine(path, u8"Data", u8"g1.dat"));
-        return File::Exists(combinedPath);
+        return IsRCT2Path(path) || IsRCTClassicPath(path);
     }
 
     std::string SanitiseFilename(std::string_view originalName)