The page you are requesting cannot be served because of the extension configuration

Error: The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map.

Solution:

In Web.Config;

<system.webServer>

<staticContent>
    <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
    <mimeMap fileExtension=".m4v" mimeType="video/m4v" />
    <mimeMap fileExtension=".ogg" mimeType="video/ogg" />
    <mimeMap fileExtension=".ogv" mimeType="video/ogg" />
    <mimeMap fileExtension=".webm" mimeType="video/webm" />

    <mimeMap fileExtension=".oga" mimeType="audio/ogg" />
    <mimeMap fileExtension=".spx" mimeType="audio/ogg" />

    <mimeMap fileExtension=".svg" mimeType="images/svg+xml" />
    <mimeMap fileExtension=".svgz" mimeType="images/svg+xml" />

    <remove fileExtension=".eot" />
    <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
    <mimeMap fileExtension=".otf" mimeType="font/otf" />
    <mimeMap fileExtension=".woff" mimeType="font/x-woff" />
</staticContent>

</system.webServer> 

Custom RSS Feed in Sharepoint

http://avinashkt.blogspot.com/2010/03/custom-rss-feed-in-sharepoint.html

SharePoint 2010 Mobile Site Disable

Web.Config

<system.web>
<browserCaps>
 <result type="System.Web.Mobile.MobileCapabilities, System.Web.Mobile, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
 <filter>isMobileDevice=false</filter>
</browserCaps>
</system.web>

SharePoint Backup and Restore

Backup

stsadm -o backup -url http://sharepointsite -filename D:\Backup\backup.bak

Restore

stsadm -o restore -url http://sharepointsite -filename D:\Backup\backup.bak -overwrite

Anonymous Users cannot open XLSX files from a SharePoint document library

$siteUrl = "http://URL_of_your_SITE";
$site = New-Object Microsoft.SharePoint.SPSite($siteurl);
$web = $site.OpenWeb();
 
$enumPerms = [Microsoft.SharePoint.SPBasePermissions];
 
Write-Host $web.AnonymousPermMask64;
$web.AnonymousPermMask64 = $web.AnonymousPermMask64 -bor $enumPerms::OpenItems
$web.Update();
Write-Host $web.AnonymousPermMask64;
 
$web.Dispose();
$site.Dispose();

http://support.microsoft.com/kb/2498047

Unable to add selected web part

ERROR:
Assemblies that implement ASP.NET Web Parts and are installed into a partially trusted location, such as the bin directory, must be compiled with the AllowPartiallyTrustedCallersAttribute set for import to succeed.

SOLUTION:
Add [assembly:AllowPartiallyTrustedCallers] to AssemblyInfo.cs

SharePoint 2010 Change your display of welcome name

In Powershell:

Set-SPuser -identity “DOMAIN\accountname” -DisplayName “Name Surname” -web <URL of Site>