win32 API write file() to append text

[EDN Admin]

hi
im writing an application where error messages are written into a text file.
text file is created using win32API  createfile() function.
after that everytime an error occurs the message is written into the text file with writefile() API.
but whenever a new message is written the old text in the file is getting overwritten.
 
i want to append the new message at the end of the  text already in the file.
 
can anyone help.
 
thanks in advance

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