Hi Dam,
Thanks for getting back to me.
I've tried different files which are a lot smaller (20 - 60Mb in size) and these seem to get added ok.
However I've tried 4 other larger files (250Mb, 300Mb, 350Mb and 450Mb) and they do the same thing - they make the app quit or freeze.
On one occation I got this error message (below) - but only once and haven't been able to repeat it
"Access violation at address 7C910CAE in Module ‘ntdll.dll’. Read of address 80808080"
Any ideas???
Many thanks,
suttomar