When a user visits a Web site that you own, and the user downloads a file by using Windows Internet Explorer 7,
the user may find that certain characters in
the file name are converted to underscore characters (_) after they download the file.
This problem occurs when any of the following characters
are in
the file name.
Collapse this tableExpand this table
| Character | Name |
|---|
| < | Left angle bracket |
| > | Right angle bracket |
| \ | Backslash |
| " | Quotation mark |
| / | Slash mark |
| : | Colon |
| | | Vertical bar |
| ? | Question mark |
| * | Asterisk |
| Space |
This problem occurs because the
Wininet.dll file
resolves
certain file stream issues when users download files by using Internet Explorer 7.
To resolve this problem, do not use "Content-Disposition: Attachment; filename=" HTTP header.
If
a file name in this header contains a certain special characters,
the cache code calls the
CreateFileA() method on that name. If you use
the NTFS file system, an alternative stream is created. Then, the WinInet.dll file writes only
to the alternative stream.
When a cache entry is committed, the file
name is included in the cache entry. Because the
CreateFileA() method on the
named stream works, the WinInet.dll file does not generate an error. Instead,
it uses a random name. Therefore, when the cache entry is retrieved, and the
caller tries to open the file, the open operation fails because WinInet.dll
file tries to open the
FileName file. Instead, the WinInet.dll file must open
the
FileName:$DATA file.
Therefore, you cannot cache or download
content when the Content-Disposition file name token contains a file name that
uses one of the special characters that are listed in the "Symptoms" section. The new version of the WinInet.dll file resolves this
problem by checking for these characters and replacing them with an
underscore character.