CSV files used to open in Excel....not now!

For a long time I have kept detailed records from my phone provider personal analysis to ensure being on the correct package Throughout the csv files from the company downloaded have opened by default in Excel 2007 Home and Student, but suddenly they open in Notepad. I do not recall making a change,

I am confused how to change the default, as I am unable to find Excel in the list of applications, even though it's installed.
FWIW alongside Excel is the File Valuation AddIn in case that may be somehow relevant.

Can someone, please help?

dalchina said:

You can't find Excel in (an unspecified) list of applications. I don't know which list that is for sure.

On a Windows 7 system that had Office 2007 installed and was then upgraded to Windows 10 it appears here...



and here...



but is not listed in Settings > System > Default apps > Set defaults by app

@dalchina
Thanks for your input. I had thought after my OP to clean install Office.
@Bree

My equivalent page is different from yours; Excel or Word are not mentioned as such: see att.
Excel shows in Program File (86)>Office12, but I see no way to associate with the csv extension.

Just a thought, likely off beam, is whether there is some corruption making sfc /scannow useful.

chipwood said:

Bree
My equivalent page is different from yours; Excel or Word are not mentioned as such: see att.
Excel shows in Program File (86)>Office12, but I see no way to associate with the csv extension.

Looks different because a different edition of Office 2007 was used for the install, yours was Home & Student, mine wasn't.

The most basic way to associate Excel with .csv files is to right-click on a .csv and choose 'Open with... Choose another app'.



...then 'More apps', then scroll down and click 'Choose another app on this PC'. You can then browse to 'Program File (86)>Office12' and click on Excel. Tick the 'always use this app...' box to make Excel the default for .csv

If only I'd thought of changing properties
Thanks all!:)