This is what I do:
put a for each loop with a file enumerator on the source folder and specify a wildcard in the filename.
Specify that the full path should be retrieved and I put this in a variable.
On the Excel connection manager, I specify an expression using this variable.
Set DelayValidation = TRUE on the dataflow.
Normally that's all you need to do.
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MCSE Business Intelligence - Microsoft Data Platform MVP