Excel 2013 work as an “Open With…” program in Windows 7, open prn

Question:
I just recently uninstalled Office 2010 32-bit and installed Office 2013 64-bit on my computer.  I was sent some text files that are tab-delimited, so I want to open them with Excel.
I am trying to add Excel to the Open With... option in the right-click menu in Windows 7.  Every time I try, I open the selection screen, browse to Excel.exe in the Office15 folder and press OK, but it refuses to stay as an option on the selection screen.
I know that I can open Excel and then open the file, or even drag-and-drop it onto Excel, but seeing as I'll be opening a lot of these files over the next few weeks, I'd really rather add it to the right-click menu (like I used to do all the time).
Any ideas as to why it won't allow me to open that way or how to fix it?
Solution:
Press Win+R and type regedit .
HKEY_CLASSES_ROOT\Applications\EXCEL.EXE\shell\open\command\(Default)
Within this key was the following "old"value:

"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" "%1"

When I changed it to the correct, new location for Excel, it started working immediately.
"C:\Program Files\Microsoft Office 15\root\office15\EXCEL.EXE""%1"
anyway, the new path maybe different based on your system setting(office installation):
like:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.txt\OpenWithList

"C:\Program Files\Microsoft Office\office14\EXCEL.EXE" "%1"

to

"C:\Program Files\Microsoft Office\office15\EXCEL.EXE" "%1"

original site:
http://superuser.com/questions/577109/why-wont-excel-2013-work-as-an-open-with-program-in-windows-7