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Thanks for the response jconto.
The working folder and where the individuals Idevs are not the same. But, in the text file from where I read those Idevs, I'm giving the full path, so each line of has for example, 1st line: P:\folder\file1.idv, 2nd line: P:\folder\file2.idv, and so on.
Anyways, I don't know, maybe it not the way to do it! :(