can't edit empty files on some ftps

how to reproduce:

1) create an empty file on the remote browser, any name

2) right click on it and click "edit"

3) expected: the file is opened in the internal or external editor.

The expected behavior happens on our server with this log:

[19:47:51] Operation Begin
[19:47:51] MLST test
[19:47:51] 250-Start of list for test
[19:47:51]   modify=20110418174739;perm=adfrw;size=0;type=file;unique=FD06U474045;UNIX.group=48;UNIX.mode=0666;UNIX.owner=48;  test
[19:47:51] 250 End of list
[19:47:51] PASV
[19:47:51] 227 Entering Passive Mode (xxx).
[19:47:51] Opening data connection to xxx
[19:47:51] RETR test
[19:47:51] 150 Opening BINARY mode data connection for test
[19:47:51] 0 bytes transferred. (0 byte/s) (2 ms)
[19:47:51] 226 Transfer complete
[19:47:51] MLST test
[19:47:51] 250-Start of list for test
[19:47:51]   modify=20110418174739;perm=adfrw;size=0;type=file;unique=FD06U474045;UNIX.group=48;UNIX.mode=0666;UNIX.owner=48;  test
[19:47:51] 250 End of list
[19:47:51] Operation End

on some servers, no file is opened, this is the log:

[19:45:38] Operation Begin
[19:45:38] SIZE test
[19:45:38] 213 0
[19:45:38] MDTM test
[19:45:38] 213 20110418194526
[19:45:38] PASV
[19:45:38] 227 Entering Passive Mode (xxx))
[19:45:38] Opening data connection to xxx Port: 38509
[19:45:38] RETR test
[19:45:38] 0 bytes transferred. (0 byte/s) (4 ms)
[19:45:38] 150 Opening BINARY mode data connection for test (0 bytes).
[19:45:38] 226 File send OK.
[19:45:38] MDTM test
[19:45:38] 213 20110418194526
[19:45:38] Failed to set file time of "C:\Users\MC999~1.GAL\AppData\Local\Temp\3dfeee42\test". Error=0x80070002.
[19:45:38] Operation End

is this bug on the ftp server?