EctasyN5

Some large files were uploaded to my FTP (IIS 5.1) server and were badly deleted. Now when i browse in my ftproot directory with Window Explorer, i can see the files but there seems to be no way, i can open, move, copy or delete them. I have spotted the problem on the knowledge base Q304334 but the resolution doesnt work or i dont know how to do it. Anyone could help me on this one ? Thanx Peter