PDF is portable document format which is used to store and print the document. When there PDF file access denied and show the error messages. In such situation you can follow the below steps.
1. First right click on the file.
2. Select properties, then security tab -> continue
3. In the "Permission of MyFile.pdf" dialog press "Add"
4. Then "Select User or Groups" dialog press "Advanced"
5. Other pop up dialog Here, press "Find Now"
6. Find the username and then, double click on the username
7. Press OK in the Select "User or Group Permission" for "MyFile.pdf" and in the properties dialog.
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