I've always downloaded my Santander statement in .xls format to Linux Mint 13/LibreOffice/Calc without any problem. This months attempt has resulted LibreOffice defaulting to Writer and presenting the statement in HTML source code. I switched to my other machine WinXP Pro/Firefox into MS Excel and get the message "The file you are trying to open is a different format than specified by the file extension". I get the same result using IE8 and WinXP/Excel. I thought this was a Santander problem (currently re-working their web site), but have just tried to download my TalkTalk phone account with exactly the same result. Other files from these sites (PDF, TXT) download correctly.
That's what I can't understand. I've not altered any of my AV stuff, Linux will open the file but in HTML and this is the first time over three years I've had a problem? The report from Excel regarding the wrong extension made me think originally of wrongly written software by Santander, but now two sites don't work.
Check your router's security settings. I've no idea of your modem/router so have a google how secure it is. Change settings on it to see if that works. Follows you'll need to change connection data on all machines you have. Apparently even routers are vulnerable to being hacked. Failing that then talk to your ISP about the problem.
No, I save the file to HDD, open Calc or Excel and then try to open the file with File/Open from menu. Excel gives me the 'wrong extension' window and Linux opens LibreOffice Writer and then the file. With Linux, in the case of the Santander file it opens as HTML and the TalkTalk file opens as pure text (as though it was a .txt file). All the information contained therein is correct, just not presented in the proper manner.
Have just upgraded the firmware on my router, an OnNetworks N150, also tried my old router (Netgear DG834) and still get the same result as previously.
By the way none of my PC's are wifi, all three are ethernet connected.
In Windows might be worth going to folder options and dot the button for 'show hidden files and folders' and also untick the box for 'hide extensions for known file types'. That should show what extension the file actually is.
I don't like the "The file you are trying to open is a different format than specified by the file extension" info.
I'm always paranoid with security so if I'm way out and there's a simpler solution I apologise but certainly worth checking when it comes to Banking online.