Microsoft KB Archive/177665

= Path Too Long Error Message When Exceeding MAX_PATH =

Article ID: 177665

Article Last Modified on 10/31/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q177665



SYMPTOMS
Windows 95 and Windows NT 4.0 clients can expand a server directory structure beyond MAX_PATH (256 characters) by accessing a server share and creating directories and files through the network.

As a result, a server running Windows NT 4.0 returns the following error message if the server administrator tries to access these files or directories locally on the server through Windows NT Explorer:

Can't access this folder.

Path is too long.

If you attempt to create a new folder, you may receive the following error message:

Unable to create the folder ' '.

The filename or extension is too long.

A server running Windows NT 3.51 shows unexpected results in File Manager such as a general protection fault (GP fault), WINFILE crash, or display of nonexistent directories.

Several tools and programs may also show problems when working with this directory structure that exceeds MAX_PATH.



CAUSE
Win32 programs are limited to a 256-character string size limit because of the MAX_PATH variable. Software programs can work around this problem by passing Win32 a path that is MAX_PATH or less. The real underlying path can then be accessed independently of the real length of the path. In this way, a program can access files or directories beyond MAX_PATH on the server.



RESOLUTION
To resolve problems when the directory structure exceeds MAX_PATH, use either of the following methods:
 * On the server that contains the long directory structure, access these files and folders through a local redirection ("net use" or "subst") of the same share/folder that the network clients access across the network.
 * In Windows NT Explorer, select the folder one level above the folder that returns the error. Right-click the folder returning the error and then click Rename. Rename the folder to reduce the number of characters used in the folder name.



MORE INFORMATION
The problem described above could not be reproduced with NTBACKUP and files and directories that were beyond the MAX_PATH limit could be backed up and restored successfully.

Additional query words: User Interface explore

Keywords: kberrmsg kbnofix kbprb kbui KB177665

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