-qfile_t *FS_Open (const char* filepath, const char* mode, qboolean quiet, qboolean nonblocking);
+void FS_CreatePath (char *path);
+int FS_SysOpenFD(const char *filepath, const char *mode, qboolean nonblocking); // uses absolute path
+qfile_t* FS_SysOpen (const char* filepath, const char* mode, qboolean nonblocking); // uses absolute path
+qfile_t* FS_OpenRealFile (const char* filepath, const char* mode, qboolean quiet);
+qfile_t* FS_OpenVirtualFile (const char* filepath, qboolean quiet);
+qfile_t* FS_FileFromData (const unsigned char *data, const size_t size, qboolean quiet);