here is the souce


// TODO: Add your control notification handler code here
if(m_strFileName == "")
{

AppendString("du musst einen File auswaehlen bevor du brennen kannst!");

}else
{
strcpy(mniiFile.fileName, m_strFileName);
strcpy(mniiFile.sourceFilePath, m_strPathName);
mniiFile.isDirectory =FALSE;
mniiFile.isReference =FALSE;
mniiFile.nextItem =FALSE;
writeCD.nwcdpCDStamp =NULL;
writeCD.nwcdArtist =NULL;
writeCD.nwcdTitle =NULL;
writeCD.nwcdCDExtra =FALSE;
writeCD.nwcdNumTracks= 0;
writeCD.nwcdMediaType =MEDIA_CD;
int i= m_cbxDevice.GetCurSel();

NERO_SCSI_DEVICE_INFO* msdiDevice=
(NERO_SCSI_DEVICE_INFO*)m_cbxDevice.GetItemDataPtr(1);

and this is the error error :C2065: 'AppendString' : undeclared identifier

You should know best what AppendString is. That symbol is not part of NeroAPI. It sounds like your user-defined function.