Premitted user cannot access file directly from explorer.exe

Hi all,

I am sharing my document with my teammates, which located in windows 2012 file server, so I attached the file UNC path in an email and distribute to them. But they cannot access the file when they click on the link, the system shown

Network Error
Windows cannot access
\\ad.local\filesrv\pool$\departmentpool\admpool\excel.xls
Check the spelling of the name. Otherwise, there might be a problem with your network.
To try to identify and resolve network problems, click Diagnose.
Error code:0x80004005
Unspecified error

I am sure my teammates have sufficient NTFS and windows share right to read the file, because we are mapping to same network folder. I was checked my teammates has proper right to access the file from "effective permission" on windows server. Also, my teammates can browse "\ad.local\filesrv\pool$\departmentpool\admpool" without any problem.

I try to paste the link in cmd.exe and execute it, we can access the file without any problem.

This is a windows server 2012 fileserver and a windows 7 64-bit client.