>Hello Naomi
>What is the Excel version of the file?
>I have Office Excel 2007 , but i save the file in excel 97-2003 (.XLS)
>
>Also, is msg a custom function?
>Yes , is equivalent on VFP to messagebox()
> Add BROWSE command right after append to see if append worked (this is just for testing).
>Nothing appear and my program crash.
>
>the captionj of error is :
>Unhandled exception at 0x003e003f in myapplication.exe: 0xC0000005: Access violation writing location 0x003e003e.
>
>I hope is this is help you.
>
>Many thanks Naomi

How big is this Excel file? Also, did you try to run the commands you showed separately, just in a little program of its own - to figure out if there is some problem with that Excel file?

Also, what is the temp folder in your application?
=messagebox(sys(2023))