The answer is right there in the error message -- you just have to read it carefully. Here is just the filename string from the error message: 
D:/www/data/text/D:/www/data/text/Ένα μήνυμα σε όλους τους άπιστους.txt
Can you see the problem now? You have the value of $_, which comes from a file glob, and that value is: 
D:/www/data/text/Ένα μήνυμα σε όλους τους άπιστους.txt
Then, inside the loop, you append that value to this string: 
$ENV{'DOCUMENT_ROOT'}/data/text/
and the result of that concatenation is that the disk and directory path appears twice in the string that is passed to "open()". Fix that, and it will probably work as intended.

In reply to Re^3: Error in insertion of MULTIPLE FILENAMES & CONTENTS INTO DATABASE by graff
in thread Error in insertion of MULTIPLE FILENAMES & CONTENTS INTO DATABASE by Nik

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