Re: performance question

well, ok. If you can not group your files in a reserved folder, you may add a specific mark in their names.

 Example name becomes _SYNTH_name.cls or name_MARKER.xls
 or anything of your choice.

 Then there's a difference with other books.

 for example when reading the names, just check that
left( filename , 6) = "_SYNTH_"
.

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