Thanks everybody! but no success until now.

Does that mean that rd /s/q /the/rootdir didn't work?

By the way i have not tried last suggestion:

then you'll have to construct the paths in the full domain name form, and then convert them to UTF16LE

Let's say i have a folder c:\temp\folder_0\folder_1\... (100 times) running on a pc called "myhost". How should the full domain path look like in such case?

Well first off, you'll not easily be able to create that path using perl, because all the standard apis you might try to use to do so, are subject to the same 260 char restriction. With the 10 chars of \folder_nn at each element the furthest you are going to get is folder_24 or 25 depending.

But say for example you decided to go ahead with this anyway and use Win32API::File or Win32::API to achieve your goal, then you would need to construct these ludicrous pathnames in full unicode UNC form (per this document (under Maximum Path Length) which bits of your OP hinted at your being aware of).

To do that, you might use code something like:

use Encode qw[ from_to ];

my $path = join '\\', 'c:', 'test', map qq[folder_$_], '00'..'99';

$path = "\\\\?\\" . $path;

Encode::from_to(  $path, 'utf8', 'utf16le' );

print $path;
[download]

Which results in paths that display something along the lines of:

\ \ ? \ c : \ t e s t \ f o l d e r _ 0 0 \ f o l d e r _ 0 1 \ f o l 
+d e r _ 0 2 \ f o l d e r _ 0 3 \ f o l d e r _ 0 4 \ f o l d e r _ 0
+ 5 \ f o l d e r _ 0 6 \ f o l d e r _ 0 7 \ f o l d e r _ 0 8 \ f o 
+l d e r _ 0 9 \ f o l d e r _ 1 0 \ f o l d e r _ 1 1 \ f o l d e r _
+ 1 2 \ f o l d e r _ 1 3 \ f o l d e r _ 1 4 \ f o l d e r _ 1 5 \ f 
+o l d e r _ 1 6 \ f o l d e r _ 1 7 \ f o l d e r _ 1 8 \ f o l d e r
+ _ 1 9 \ f o l d e r _ 2 0 \ f o l d e r _ 2 1 \ f o l d e r _ 2 2 \ 
+f o l d e r _ 2 3 \ f o l d e r _ 2 4 \ f o l d e r _ 2 5 \ f o l d e
+ r _ 2 6 \ f o l d e r _ 2 7 \ f o l d e r _ 2 8 \ f o l d e r _ 2 9 
+\ f o l d e r _ 3 0 \ f o l d e r _ 3 1 \ f o l d e r _ 3 2 \ f o l d
+ e r _ 3 3 \ f o l d e r _ 3 4 \ f o l d e r _ 3 5 \ f o l d e r _ 3 
+6 \ f o l d e r _ 3 7 \ f o l d e r _ 3 8 \ f o l d e r _ 3 9 \ f o l
+ d e r _ 4 0 \ f o l d e r _ 4 1 \ f o l d e r _ 4 2 \ f o l d e r _ 
+4 3 \ f o l d e r _ 4 4 \ f o l d e r _ 4 5 \ f o l d e r _ 4 6 \ f o
+ l d e r _ 4 7 \ f o l d e r _ 48 \ f o l d e r _ 4 9 \ f o l d e r _
+ 5 0 \ f o l d e r _ 5 1 \ f o l d e r _ 5 2 \ f o l d e r _ 5 3 \ f 
+o l d e r _ 5 4 \ f o l d e r _ 5 5 \ f o l d e r _ 5 6 \ f o l d e r
+ _ 5 7 \ f o l d e r _ 5 8 \ f o l d e r _ 5 9 \ f o l d e r _ 6 0 \ 
+f o l d e r _ 6 1 \ f o l d e r _ 6 2 \ f o l d e r _ 6 3 \ f o l d e
+ r _ 6 4 \ f o l d e r _ 6 5 \ f o l d e r _ 6 6 \ f o l d e r _ 6 7 
+\ f o l d e r _ 6 8 \ f o l d e r _ 6 9 \ f o l d e r _ 7 0 \ f o l d
+ e r _ 7 1 \ f o l d e r _ 7 2 \ f o l d e r _ 7 3 \ f o l d e r _ 7 
+4 \ f o l d e r _ 7 5 \ f o l d e r _ 7 6 \ f o l d e r _ 7 7 \ f o l
+ d e r _ 7 8 \ f o l d e r _ 7 9 \ f o l d e r _ 8 0 \ f o l d e r _ 
+8 1 \ f o l d e r _ 8 2 \ f o l d e r _ 8 3 \ f o l d e r _ 8 4 \ f o
+ l d e r _ 8 5 \ f o l d e r _ 8 6 \ f o l d e r _ 8 7 \ f o l d e r 
+_ 8 8 \ f o l d e r _ 8 9 \ f o l d e r _ 9 0 \ f o l d e r _ 9 1 \ f
+ o l d e r _ 9 2 \ f o l d e r _ 9 3 \ f o l d e r _ 9 4 \ f o l d e 
+r _ 9 5 \ f o l d e r _ 9 6 \ f o l d e r _ 9 7 \ f o l d e r _ 98 \ 
+f o l d e r _ 9 9
[download]

And if that hasn't put you off the idea, then know that none of the standard tools--perl, shell, explorer, etc.--will allow you to type, view or manipulate such behemoths. But, at least in theory, the wide (suffixW) system apis will allow you to manipulate that 1000+char (2000+byte) baby, and much, much longer; upto 32K apparently. I've no idea whether that is 32k bytes or 32k chars, but then, does it matter?

Bottom line: if you can really come up with a good reason for doing this, and are prepared to put the effort into to doing so, then the system has apis that will allow you to do it; and Perl will give you access to those APIs. All you have to do is put in the reading and the work.

Good luck :)