I'm afraid WinSCP is not compatible with your server.
https://winscp.net/tracker/49

Hi,

Iam using 4.3.7 Winscp to transfer files from windows to Mainframe ..Files are getting transfered successfully in SFTP..
But We are receiving the Following error message when i choose FTP.
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Error
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Error listing directory ''BXVTDFT..''.
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Could not retrieve directory listing
CWD cmd failed : EDC5129I No such file or directory. (errno2=0x0594003D)
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OK Help
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Error log :
<2012-05-04 00:55:25.129 CWD /'BXVTDFT.'/'BXVTDFT.'/
< 2012-05-04 00:55:25.176 550 CWD cmd failed : EDC5129I No such file or directory. (errno2=0x0594003D)
> 2012-05-04 00:55:25.176 CWD /'BXVTDFT.'/
< 2012-05-04 00:55:25.207 550 CWD cmd failed : EDC5129I No such file or directory. (errno2=0x05190050)
> 2012-05-04 00:55:25.207 CWD /
< 2012-05-04 00:55:25.238 250 HFS directory / is the current working directory
> 2012-05-04 00:55:25.238 MKD 'BXVTDFT.'
< 2012-05-04 00:55:25.301 550 Mkd fails: BXVTDFT.. User not authorized
> 2012-05-04 00:55:25.301 CWD /'BXVTDFT.'/
< 2012-05-04 00:55:25.348 550 CWD cmd failed : EDC5129I No such file or directory. (errno2=0x05190050)
. 2012-05-04 00:55:25.348 Copying files to remote side failed.
* 2012-05-04 00:55:25.348 (ExtException) Copying files to remote side failed.

.........
Can u pls help me...