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Delete folders with blank or reserved names

Hackers or Crackers often use folders with reserved filenames to make it difficult for a system

administrator to remove files, particularly when those hackers get into your FTP server and start

using it to host their own files.



Typically, you can use DEL on a FAT file system to delete files with reserved names, but on NTFS

you need to use Rm.exe, a tool included with the Windows 2000 Resource Kit. If you can't take

ownership of the folder or file, however, you'll get an Access Denied message when you try to

remove the file.



Windows 2000 provides an option in the GUI to take ownership of a folder or file, but this method

can fail when the folder or subfolder contains a reserved or blank name. The answer is to use

another Windows 2000 Resource Kit tool, Subinacl.exe, to take ownership of the item.



To use Subinacl.exe, you first need to determine the item's short filename, which you can do by

executing this command in the item's parent folder:



dir /x



Armed with the short name, use the Subinacl.exe command to take ownership and grant full

access:



subinacl.exe /file <path>\<shortname> /setowner=administrator

/grant=administrator=f



If you need to take ownership of an entire directory tree, use the /subdirectories switch with the

command, as shown in this example:



subinacl.exe /subdirectories <path> /setowner=administrator /grant=administrator=f



In some cases, you might need to use multiple Subinacl.exe commands to take ownership and gain

access to a lengthy subdirectory tree.



After you take ownership and grant full access to the reserved folder or file, you should be able to

remove it using Rm.exe.

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