Thx J. Random Programmer

He helped me rewrite the sprite loading functions to be compatible, he should get some credit

olcConsoleGameEngineSDL.h

@@ -289,7 +289,7 @@ public:
 		Create(w, h);
 	}
 
-	olcSprite(std::wstring sFile)
+	olcSprite(std::string sFile)
 	{
 		if (!Load(sFile))
 			Create(8, 8);
@@ -370,30 +370,15 @@ public:
 
 	    bool Save(std::string sFile)
     {
-		FILE *f = nullptr;
+                std::ofstream f(sFile.c_str(), std::ios::out | std::ios::binary);
+                if (!f.is_open()) return false;
 
-		char buff[256];
-#ifdef _WIN32
-		size_t t;
-		wcstombs_s(&t, buff, sFile.c_str(), 256);
-#else
-		wcstombs(buff, sFile.c_str(), 256);
-#endif
-
-#ifdef _WIN32
-		fopen_s(&f, buff, "wb");
-#else
-		f = std::fopen(buff, "wb");
-#endif
-		if (f == nullptr)
-			return false;
-
-		fwrite(&nWidth, sizeof(int), 1, f);
-		fwrite(&nHeight, sizeof(int), 1, f);
-		fwrite(m_Colours, sizeof(short), nWidth * nHeight, f);
-		fwrite(m_Glyphs, sizeof(wchar_t), nWidth * nHeight, f);
+                f.write((char*)&nWidth, sizeof(int));
+        f.write((char*)&nHeight, sizeof(int));
+        f.write((char*)m_Colours, sizeof(short) * nWidth * nHeight);
+        f.write((char*)m_Glyphs, sizeof(wchar_t) * nWidth * nHeight);
 
-		fclose(f);
+        f.close();
 
         return true;
     }
@@ -405,32 +390,20 @@ public:
         nWidth = 0;
         nHeight = 0;
 
-		FILE *f = nullptr;
-		char buff[256];
-#ifdef _WIN32
-		size_t t;
-		wcstombs_s(&t, buff, sFile.c_str(), 256);
-#else
-		wcstombs(buff, sFile.c_str(), 256);
-#endif
-
-#ifdef _WIN32
-		fopen_s(&f, buff, "rb");
-#else
-		f = std::fopen(buff, "rb");
-#endif
-		if (f == nullptr)
-			return false;
+                std::ifstream f(sFile.c_str(), std::ios::in | std::ios::binary);
+                if (!f.is_open()) return false;
 
-		fread(&nWidth, sizeof(int), 1, f);
-		fread(&nHeight, sizeof(int), 1, f);
+                // get file data
+                f.read ((char*)&nWidth, sizeof(int));
+                f.read ((char*)&nHeight, sizeof(int));
 
         Create(nWidth, nHeight);
                 
-		fread(m_Colours, sizeof(short), nWidth * nHeight, f);
-		fread(m_Glyphs, sizeof(wchar_t), nWidth * nHeight, f);
+                f.read ((char*)m_Colours, sizeof(short) * nWidth * nHeight);
+                f.read ((char*)m_Glyphs, sizeof(wchar_t) * nWidth * nHeight);
+
+                f.close();
 
-		fclose(f);
         return true;
     }
 };