Error: “Excel cannot access example.xls. The Document may be read only or encrypted”

Notice:
This is happening because you are accesssing a file which has read only permission or permission not set at all...
Resolution:
- In case of FAT file format, Simply go to properties of that particular file and uncheck the read only check box. if the box is not ticked, then tick and un-tick it and apply. This will replace the file permission.
- If NTFS file format, Go to folder Option > View > Uncheck “use simple file sharing”.Note: This will enable the security tab in "XP NTFS File Format"
- Now right click on the file or folder you are accessing.
- Properties > security tab
- If the entire or required user groups exist, check for the recommended permissions for the particular users.Now click on advance tab and check “replace permissions entries on all child objects....”
- If the entire or required user groups doesn’t exists, Click on Add, Select users > Type the users name as per the recommendation.Click advance tab and “replace permissions entries on all child objects…”
This will Enable the required permission to access that particular file.