diff --git a/core/logic/intercom.h b/core/logic/intercom.h
index bb8fb9d2..00d6ed3e 100644
--- a/core/logic/intercom.h
+++ b/core/logic/intercom.h
@@ -51,7 +51,7 @@ using namespace SourceHook;
  * Add 1 to the RHS of this expression to bump the intercom file
  * This is to prevent mismatching core/logic binaries
  */
-#define SM_LOGIC_MAGIC		(0x0F47C0DE - 26)
+#define SM_LOGIC_MAGIC		(0x0F47C0DE - 27)
 
 #if defined SM_LOGIC
 class IVEngineServer
@@ -82,6 +82,7 @@ public:
 	virtual char *ReadLine(char *pOutput, int maxChars, FileHandle_t file) = 0;
 	virtual bool EndOfFile(FileHandle_t file) = 0;
 	virtual bool FileExists(const char *pFileName, const char *pPathID = 0) = 0;
+	virtual unsigned int Size(const char *pFileName, const char *pPathID = 0) = 0;
 };
 
 namespace SourceMod
diff --git a/core/logic/smn_filesystem.cpp b/core/logic/smn_filesystem.cpp
index 11f52093..26575acf 100644
--- a/core/logic/smn_filesystem.cpp
+++ b/core/logic/smn_filesystem.cpp
@@ -426,6 +426,18 @@ static cell_t sm_FileSize(IPluginContext *pContext, const cell_t *params)
 		return -1;
 	}
 
+	if (params[0] >= 2 && params[2] == 1)
+	{
+		if (smcore.filesystem->FileExists(name))
+		{
+			return smcore.filesystem->Size(name);
+		}
+		else
+		{
+			return -1;
+		}
+	}
+
 	char realpath[PLATFORM_MAX_PATH];
 	g_pSM->BuildPath(Path_Game, realpath, sizeof(realpath), "%s", name);
 #ifdef PLATFORM_WINDOWS
diff --git a/core/logic_bridge.cpp b/core/logic_bridge.cpp
index a047943b..e386d55c 100644
--- a/core/logic_bridge.cpp
+++ b/core/logic_bridge.cpp
@@ -138,6 +138,10 @@ public:
 	{
 		return filesystem->FileExists(pFileName, pPathID);
 	}
+	unsigned int Size(const char *pFileName, const char *pPathID = 0)
+	{
+		return filesystem->Size(pFileName, pPathID);
+	}
 };
 
 static VFileSystem_Logic logic_filesystem;
diff --git a/plugins/include/files.inc b/plugins/include/files.inc
index ab9eaf70..4da32671 100644
--- a/plugins/include/files.inc
+++ b/plugins/include/files.inc
@@ -303,9 +303,9 @@ native FilePosition(Handle:file);
  *
  * @param path			Path to the file.
  * @param use_valve_fs	If true, the Valve file system will be used instead.
- *						This can be used to check for the existance of files 
- *						inside GCFs or the game cache, rather than solely files 
- *						that are on disk.
+ *						This can be used to find files existing in any of
+ *						the GAME search paths, rather than solely files 
+ *						existing directly in the gamedir.
  * @return				True if the file exists, false otherwise.
  */
 native bool:FileExists(const String:path[], bool:use_valve_fs=false);
@@ -331,9 +331,13 @@ native bool:DirExists(const String:path[]);
  * Get the file size in bytes.
  *
  * @param path			Path to the file.
+ * @param use_valve_fs	If true, the Valve file system will be used instead.
+ *						This can be used to find files existing in any of
+ *						the GAME search paths, rather than solely files 
+ *						existing directly in the gamedir.
  * @return				File size in bytes, -1 if file not found.
  */
-native FileSize(const String:path[]);
+native FileSize(const String:path[], bool:use_valve_fs=false);
 
 /**
  * Flushes a file's buffered output; any buffered output