After giving the Full Trust to the Form template (See here), we will be able to preview the InfoPath form and get information from other domains, or access files and settings on a user’s computer. But when we publish InfoPath form on SharePoint and try to access the from then you will be getting this error. 😦
Text format of the error:
Form template: file:///C:\Documents%20and%20Settings\RajanihanthV\Desktop\XmlProc\InfoPath\ADInfo.xsn</pre> The form template is trying to access files and settings on your computer. InfoPath cannot grant access to these files and settings because the form template is not fully trusted. For a form to run with full trust, it must be installed or digitally signed with a certificate.
If we need to access the form from SharePoint, we need to be digitally signed the form even it is fully trusted. This is pretty simple, but we have to do this process after publishing the form on SharePoint only. Here are the steps.
Step 1: Navigate to the Document (form) Library, where your form published
Step 2: Click Settings on the Document Library Settings
Step 3: Advanced Settings
Step 4: Edit Template
Step 5: Click the Form Options on the Tools menu
Step 6: Click Sign this Form Template and create or select certificate, then OK
That’s all. You can try and see. 🙂
This will work only for you (author), If you want give access to all users you have to get the digital signature from 3rd party vendors and signed the form.