We have some sales managers that access our network over a VPN.  When one particular salesman goes to some excel files, when he tries to open them directly, his IE10 pops up and then a small screen asking about open, save or save as shows. If he hits open, he gets an error saying the file has an invalid extension.  If the user copies the excel file to his local desktop, it opens with no problems at all.  To my knowledge, not a single other user has this problem. (We have about 15 people coming in over the VPN).  

It is extremely tedious for the salesman to have to copy every file he needs to see to his local desktop so hopefully we can figure something out.  Any ideas?

Thank you very much in advance to anyone who takes the time to try and help.

More info:

On my PC, when I open the VPN and I check the properties of the file, it shows me the exact location of the file on the server. When this salesman does it, the file actually says ftp://john@(ip address and file location). Mine doesn't say FTP anywhere.  Hopefully this helps us narrow down the problems here.

Thanks.

Hi,

This issue only occurs to this file or all the files?

And try to login with some other user account on that computer to check whether the issue still occur.

If the issue do not occur when login with other account, then the issue maybe caused by the user account.

Thanks so much for replying.

We spent some time going through all of the IE10 settings and we unchecked Use Passive FTP.  This worked for the user.

Thanks again for the response and hopefully this solution helps others.

King