>Am trying to "Append From" an Excel file and getting the following error message:
>
>"Microsoft Excel file format is invalid."
>
>I can open the file OK in Excel, but Append from (lcFilename) XLS fails ... it looks like it is saved in a different format of worksheet than the files I had been receiving (I import this file every week)
>
>Any suggestions?
>
>Thanks

It may be saved in the new (Office 2007) format. Take a look here, the problem was already discussed.