Does this help?
Internet Explorer Does Not Save Graphics Files in the Proper Format if Username

assword Is Part of the URL (Q260650)
--------------------------------------------------------------------------------
The information in this article applies to:
Microsoft Internet Explorer version 6 for Windows XP
Microsoft Internet Explorer version 6 for Windows 2000
Microsoft Internet Explorer version 5.5 , for Windows 2000
Microsoft Internet Explorer version 6 for Windows NT 4.0
Microsoft Internet Explorer version 5.5 , for Windows NT 4.0
Microsoft Internet Explorer version 6 for Windows Millennium Edition
Microsoft Internet Explorer version 5.5 , for Windows Millennium Edition
Microsoft Internet Explorer version 6 for Windows 98 Second Edition
Microsoft Internet Explorer version 5.5 , for Windows 98 Second Edition
Microsoft Internet Explorer version 6 for Windows 98
Microsoft Internet Explorer version 5.5 , for Windows 98
Microsoft Internet Explorer version 5.5 , for Windows 95
--------------------------------------------------------------------------------
SYMPTOMS
When you use the Save Picture As option for a graphics file in Microsoft Internet Explorer, you are only allowed to save the file as a BMP file, even if the file is in another format, for example, GIF or JPEG. The file name may also appear as 'Untitled'.
CAUSE
There are several reasons why this issue may occur.
This issue may occur if your Temporary Internet pages cache is full.
This issue can occur if you have "Do not save encrypted pages to disk" selected in Tools, Options, Advanced Tab and are loading the page over a secure connection (https).
This issue can occur when you connect to a Web site using an address that contains <username

assword>. For example, the server is accessed through
http://<username
[email protected]>/default.htm, instead of
http://<site>/default.htm.
For more information about an additional cause for this issue, click the article number below to view the article in the Microsoft Knowledge Base:
Q250747 Right-Clicking, Selecting 'Save Picture As' Does Not Save Image with Correct Extension
WORKAROUND
You can use any one of three methods to work around this issue.
Workaround for Cause 1
To resolve, delete the temporary internet files by selecting Tools, Options, General tab and select the Delete Files button.
NOTE: To locate the Temporary Internet Files folder, click Options on the Tools menu, click the General tab, and then click Settings. The current location is indicated in the Settings dialog box.
Workaround for Cause 2
To workaround, uncheck "Do not save encrypted pages to disk" from Tools, Options, Advanced Tab. Then select View, Refresh to reload the page.
Workaround for Cause 3
Method 1
Open the Temporary Internet Files directory and locate the image that you attempted to save.
Right click the image and click Open .
When the image loads into Internet Explorer, right click the image and click Save Picture As . The correct file type and name should be correct.
Method 2
Type in the direct path to the image that you wish to save.
When the image loads into Internet Explorer, right click the image and select Save Picture As . The correct file type and name should be correct.
Method 3
You can also save the file in BMP format, and then covert the file to the desired file format using a graphics editor.
STATUS
Microsoft has confirmed this to be a problem in the Microsoft products that are listed at the beginning of this article.
--------------------------------------------------------------------------------
Published Aug 23 2000 2:22PM Issue Type kbprb
Last Modifed Feb 4 2002 11:09PM Additional Query Words
Keywords kbgraphic