Hi, We got the issue, that the checkout prompt is not showing up if a user wants to open a .pdf file directly from a SharePoint library. If the user opens his local Acrobat Reader and tries "File" -> "Open" -> "direct URL", the checkout prompt works fine. Trying to check out the file via "Open with Explorer" feature from SharePoint works too. Only the web interface is not working. What we tried to solve this issue: Checkout and Open PDF files from SharePoint Document Libraries 1. We checked the DOCICON.xml and edited it to the following: <Mapping Key="pdf" Value="icpdf.png" EditText="Adobe Acrobat" OpenControl="AdobeAcrobat.OpenDocuments" OpenApp="AcroRd32"/> We changed this on all servers within our SharePoint farm and did an IIS reset. 2. We have added the PDFFIX.js script under >Template->Layouts (as described in the link above) 3. We run the powershell script as described in the link above. 4. Within SharePoint, documents are forced to open within the client application by default. We checked this on Web Application, Site Collection and library level. All of this couldn't solve our issue. Our setup: SharePoint 2013 on premise Acrobat Reader XI Windows 7 Please let us now if we are missing something. The possibility to check out PDF files is important for our users.
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