diff --git a/r5dev/public/tier0/binstream.h b/r5dev/public/tier0/binstream.h
index 4ab81cc8..f13a44cc 100644
--- a/r5dev/public/tier0/binstream.h
+++ b/r5dev/public/tier0/binstream.h
@@ -12,15 +12,12 @@ public:
 	};
 
 	CIOStream();
-	CIOStream(const fs::path& fsFileFullPath, int nFlags);
 	~CIOStream();
 
-	bool Open(const fs::path& fsFileFullPath, int nFlags);
+	bool Open(const char* const pFilePath, const int nFlags);
 	void Close();
 	void Flush();
 
-	void ComputeFileSize();
-
 	std::streampos TellGet();
 	std::streampos TellPut();
 
@@ -76,6 +73,7 @@ public:
 		return value;
 	}
 	bool ReadString(std::string& svOut);
+	bool ReadString(char* const pBuf, const size_t nLen);
 
 	//-----------------------------------------------------------------------------
 	// Purpose: writes any value to the file
diff --git a/r5dev/sdklauncher/sdklauncher.cpp b/r5dev/sdklauncher/sdklauncher.cpp
index 2f127dc3..4191e50b 100644
--- a/r5dev/sdklauncher/sdklauncher.cpp
+++ b/r5dev/sdklauncher/sdklauncher.cpp
@@ -4,6 +4,7 @@
 //
 //=============================================================================//
 #include "tier0/binstream.h"
+#include "tier1/fmtstr.h"
 #include "basepanel.h"
 #include "sdklauncher.h"
 
@@ -228,16 +229,25 @@ bool CLauncher::CreateLaunchContext(eLaunchMode lMode, uint64_t nProcessorAffini
 void CLauncher::SetupLaunchContext(const char* szConfig, const char* szGameDll, const char* szCommandLine)
 {
     CIOStream cfgFile;
-    string commandLine;
+    CFmtStrMax commandLine;
 
     if (szConfig && szConfig[0])
     {
-        if (cfgFile.Open(Format(GAME_CFG_PATH"%s", szConfig), CIOStream::READ))
+        commandLine.Format(GAME_CFG_PATH"%s", szConfig);
+
+        if (cfgFile.Open(commandLine.String(), CIOStream::READ))
         {
-            if (!cfgFile.ReadString(commandLine))
+            // Reuse the stack string for the actual command line buffer.
+            commandLine.Clear();
+
+            if (!cfgFile.ReadString(commandLine.Access(), commandLine.GetMaxLength()))
             {
                 AddLog(spdlog::level::level_enum::err, "Failed to read file '%s'!\n", szConfig);
             }
+            else
+            {
+                commandLine.SetLength(strlen(commandLine.String()));
+            }
         }
         else // Failed to open config file.
         {
@@ -247,18 +257,18 @@ void CLauncher::SetupLaunchContext(const char* szConfig, const char* szGameDll,
 
     if (szCommandLine && szCommandLine[0])
     {
-        commandLine.append(szCommandLine);
+        commandLine.Append(szCommandLine);
     }
 
     m_svGameDll = Format("%s\\%s", m_svCurrentDir.c_str(), szGameDll);
-    m_svCmdLine = Format("%s\\%s %s", m_svCurrentDir.c_str(), szGameDll, commandLine.c_str());
+    m_svCmdLine = Format("%s\\%s %s", m_svCurrentDir.c_str(), szGameDll, commandLine.String());
 
     ///////////////////////////////////////////////////////////////////////////
     // Print the file paths and arguments.
     std::cout << "----------------------------------------------------------------------------------------------------------------------" << std::endl;
     AddLog(spdlog::level::level_enum::debug, "- CWD: %s\n", m_svCurrentDir.c_str());
     AddLog(spdlog::level::level_enum::debug, "- EXE: %s\n", m_svGameDll.c_str());
-    AddLog(spdlog::level::level_enum::debug, "- CLI: %s\n", commandLine.c_str());
+    AddLog(spdlog::level::level_enum::debug, "- CLI: %s\n", commandLine.String());
     std::cout << "----------------------------------------------------------------------------------------------------------------------" << std::endl;
 }
 
diff --git a/r5dev/tier0/binstream.cpp b/r5dev/tier0/binstream.cpp
index e0f41f37..73f04a66 100644
--- a/r5dev/tier0/binstream.cpp
+++ b/r5dev/tier0/binstream.cpp
@@ -1,4 +1,5 @@
 #include "tier0/binstream.h"
+#include <sys/stat.h>
 
 //-----------------------------------------------------------------------------
 // Purpose: CIOStream constructors
@@ -8,10 +9,6 @@ CIOStream::CIOStream()
 	m_nSize = 0;
 	m_nFlags = Mode_t::NONE;
 }
-CIOStream::CIOStream(const fs::path& svFileFullPath, int nFlags)
-{
-	Open(svFileFullPath, nFlags);
-}
 
 //-----------------------------------------------------------------------------
 // Purpose: CIOStream destructor
@@ -26,11 +23,11 @@ CIOStream::~CIOStream()
 
 //-----------------------------------------------------------------------------
 // Purpose: opens the file in specified mode
-// Input  : &fsFilePath - 
+// Input  : *pFilePath - 
 //			nFlags - 
 // Output : true if operation is successful
 //-----------------------------------------------------------------------------
-bool CIOStream::Open(const fs::path& fsFilePath, int nFlags)
+bool CIOStream::Open(const char* const pFilePath, const int nFlags)
 {
 	m_nFlags = nFlags;
 
@@ -38,7 +35,7 @@ bool CIOStream::Open(const fs::path& fsFilePath, int nFlags)
 	{
 		m_Stream.close();
 	}
-	m_Stream.open(fsFilePath, nFlags);
+	m_Stream.open(pFilePath, nFlags);
 	if (!m_Stream.is_open() || !m_Stream.good())
 	{
 		m_nFlags = Mode_t::NONE;
@@ -47,7 +44,13 @@ bool CIOStream::Open(const fs::path& fsFilePath, int nFlags)
 
 	if (nFlags & Mode_t::READ)
 	{
-		ComputeFileSize();
+		struct _stat64 status;
+		if (_stat64(pFilePath, &status) != NULL)
+		{
+			return false;
+		}
+
+		m_nSize = status.st_size;
 	}
 
 	return true;
@@ -70,22 +73,6 @@ void CIOStream::Flush()
 		m_Stream.flush();
 }
 
-//-----------------------------------------------------------------------------
-// Purpose: computes the input file size
-//-----------------------------------------------------------------------------
-void CIOStream::ComputeFileSize()
-{
-	const std::streampos currentPos = m_Stream.tellg();
-	m_nSize = currentPos;
-
-	m_Stream.seekg(0, std::ios::end);
-	m_nSize = m_Stream.tellg() - m_nSize;
-
-	// Restore to original position.
-	m_Stream.seekg(currentPos, std::ios::beg);
-	m_Stream.clear();
-}
-
 //-----------------------------------------------------------------------------
 // Purpose: gets the position of the current character in the stream
 // Input  : mode - 
@@ -171,7 +158,7 @@ bool CIOStream::IsEof() const
 }
 
 //-----------------------------------------------------------------------------
-// Purpose: reads a string from the file and returns it
+// Purpose: reads a string from the file
 // Input  : &svOut - 
 // Output : true on success, false otherwise
 //-----------------------------------------------------------------------------
@@ -179,9 +166,43 @@ bool CIOStream::ReadString(std::string& svOut)
 {
 	if (IsReadable())
 	{
-		char c;
-		while (!m_Stream.eof() && (c = Read<char>()) != '\0')
+		while (!m_Stream.eof())
+		{
+			const char c = Read<char>();
+
+			if (c == '\0')
+				break;
+
 			svOut += c;
+		}
+
+		return true;
+	}
+
+	return false;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: reads a string from the file into a fixed size buffer
+// Input  : *pBuf - 
+//			nLen - 
+// Output : true on success, false otherwise
+//-----------------------------------------------------------------------------
+bool CIOStream::ReadString(char* const pBuf, const size_t nLen)
+{
+	if (IsReadable())
+	{
+		size_t i = 0;
+
+		while (i < nLen && !m_Stream.eof())
+		{
+			const char c = Read<char>();
+
+			if (c == '\0')
+				break;
+
+			pBuf[i++] = c;
+		}
 
 		return true;
 	}