MGET Command Returns Unintelligible Characters from IBM Host

• Microsoft Windows 95

SYMPTOMS

When you use the File Transfer Protocol (FTP) tool included with Windows 95 to send the MGET command to an IBM Host FTP server, the server may return extended or unintelligible characters. For example, you may receive the following characters from the server:

   ftp> bin
   200 Representation type is Image
   ftp> mget txt*
   mget ptpaeptp=ptp=ptp(? Y
   Error opening local file ptpaeptp=ptp=ptp(
   ptpaeptp=ptp=ptp(:Invalid argument
   ftp>

CAUSE

This behavior can occur when you set the FTP tool to Image mode (binary).

STATUS

Microsoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

MORE INFORMATION

IBM Host (mainframe or mini-computer [S/38 or AS/400]) uses Extended Binary Coded Decimal Interchange Code (EBCDIC) as the character representation scheme, whereas personal computers use American Standard Code for Information Interchange (ASCII) characters. EBCDIC is an 8-bit code and ASCII is a 7-bit code.

When you set the FTP tool to Image mode and send the MGET command as in the above example, the NLST command is sent to the IBM Host FTP server in binary format. The IBM Host FTP server has no way of knowing if the client making the request is an ASCII or EBCDIC client. It returns the list of files using EBCDIC, which is its default encoding scheme. Personal computers do not understand EBCDIC, so extended or intelligible characters are displayed.

For additional information in this issue as it affects Windows NT, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q164542
   TITLE     : MGET to an IBM Host FTP Server Returns Garbage Characters