If you experience that you can’t open PDF documents in your browser but Sharepoint automatically tries to save te file to your local disc, run the following script in powershell:
$webApp = Get-SPWebApplication http://sharepointsite
If ($webApp.AllowedInlineDownloadedMimeTypes -notcontains “application/pdf”)
{
Write-Host -ForegroundColor White “Adding Pdf MIME Type…”
$webApp.AllowedInlineDownloadedMimeTypes.Add(“application/pdf”)
$webApp.Update()
Write-Host -ForegroundColor White “Added and saved.”
} Else {
Write-Host -ForegroundColor White “Pdf MIME type is already added.”
}