Beman, you use the WinAPI call GetFileAttributesExA only twice in Boost.Filesystem, in _is_empty and file_size, but that means that the code won't run on Windows 95: file is linked to missing export KERNEL32.DLL:GetFileAttributesExA The msdn docs http://msdn.microsoft.com/library/en-us/fileio/fs/getfileattributesex.asp suggest that Win95 support requires only that you grab NewAPIs.h from the SDK Update Site. Here's an example of how it should be used: ========================================================================== http://codeproject.com/win32/harddiskspace.asp?df=100&forumid=15107&exp=0&select=466926 #define COMPILE_NEWAPIS_STUBS #define WANT_GETDISKFREESPACEEX_WRAPPER then in the file where you use GetDiskFreeSpaceEx.... #include <newapis.h> ========================================================================== Alternatively, I append a naïve implementation of the two files using GetFileAttributes and GetFileSize. Is any of this useful? Regards, Angus BOOST_FILESYSTEM_DECL bool _is_empty( const path & ph ) { DWORD const attributes = GetFileAttributes( ph.string().c_str() ); if ( attributes & INVALID_FILE_ATTRIBUTES ) boost::throw_exception( filesystem_error( "boost::filesystem::is_empty", ph, fs::detail::system_error_code() ) ); if ( attributes & FILE_ATTRIBUTE_DIRECTORY ) return is_empty_directory( ph ); DWORD file_size_high = DWORD const file_size_low = ::GetFileSize( ph.string().c_str(), &file_size_high ); if ( file_size_low == INVALID_FILE_SIZE ) { if ( GetLastError() = NO_ERROR ) boost::throw_exception( filesystem_error( "boost::filesystem::is_empty", ph, fs::detail::system_error_code() ) ); return ( !file_size_high && !file_size_low ); } BOOST_FILESYSTEM_DECL boost::intmax_t file_size( const path & ph ) { DWORD const attributes = GetFileAttributes( ph.string().c_str() ); if ( attributes & INVALID_FILE_ATTRIBUTES ) boost::throw_exception( filesystem_error( "boost::filesystem::is_empty", ph, fs::detail::system_error_code() ) ); if ( attributes & FILE_ATTRIBUTE_DIRECTORY ) boost::throw_exception( filesystem_error( "boost::filesystem::file_size", ph, "invalid: is a directory", is_directory_error ) ); DWORD file_size_high = DWORD const file_size_low = ::GetFileSize( ph.string().c_str(), &file_size_high ); if ( file_size_low == INVALID_FILE_SIZE ) { if ( GetLastError() = NO_ERROR ) boost::throw_exception( filesystem_error( "boost::filesystem::is_empty", ph, fs::detail::system_error_code() ) ); return (static_cast<boost::intmax_t>( file_size_high ) << (sizeof( file_size_low )*8)) + file_size_low }