PDF Icon does not show in the document library while uploading the pdf file.

Steps Taken for resolution

1. Copy the PDF.GIF file to “C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Template\Images”

2. Edit the file C:\Program Files\Common Files\Microsoft Shared\Web server extensions\12\Template\Xml\DOCICON.XML

1. Add an entry for the .pdf extension.
2. Reset the IIS
3. After that we were able to view the pdf icon in your document library.

Unable to open few Links on SSP Site.

Steps for resolution

1. Unable to open Search Settings page on SSP Site.

Error :- Access Denied C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\1033\STYLES\Menu.css

Solution:-
Added the WSS_ADMIN_WPG Group on the 12 Folder (Security & Groups).

2. Also unable to open User Profiles and My Sites.
Error:- HTTP 403 Page not found.

Solution:-
Checked the event viewer and ntlm authentication was failing.
And we run the below command
stsadm -o authentication -type windows -usewindowsintegrated -exclusivelyusentlm -enableclientintegration -url http://abcxyz:8080

Issue resolved.