When inserting a Sitecore Item using Insert Link in a Field Name, the .aspx extension of the inserted url is not showing. The current version im using is Sitecore 8.2
In Sitecore 8.2 this is the default behavior due to the configuration of the LinkProvider.
<linkManager defaultProvider="sitecore">
<providers>
<clear />
<add name="sitecore" type="Sitecore.Links.LinkProvider, Sitecore.Kernel"
addAspxExtension="false" alwaysIncludeServerUrl="false" encodeNames="true" languageEmbedding="asNeeded"
languageLocation="filePath" lowercaseUrls="false" shortenUrls="true" useDisplayName="false" />
</providers>
</linkManager>
The addAspxExtension attribute is set to a value of false and that instructs Sitecore to not include the .aspx extension in rendered hyperlink URLs.