Hi.
I have problem with the Office Capability Pack together with Excel viewer
2003.
I can open xlsx files with Excel 2003 and the capability pack, but if I
change so the xslx files should be open with the Excel viewer 2003 i get the
following error. €œMicrosoft Excel Viewer cannot open files of this type€�
If I try this on a computer with that Office 2003 never been installed it
works without any problem, the strange is that I dont have any problem to
open docx with Word Viewer 2003 Capability Pack.

BR R

Hi there!

It sounds like you're having trouble opening xlsx files with Excel Viewer 2003. Here are a few things you can try to resolve the issue:

1. Make sure you have the latest version of Excel Viewer 2003 installed. You can download it from the Microsoft website.
2. Check if the file you're trying to open is corrupted. Try opening a different xlsx file to see if the issue persists.
3. Try repairing the Office Capability Pack. To do this, go to Control Panel Programs and Features Microsoft Office Compatibility Pack Change Repair.
4. If none of the above solutions work, you may need to uninstall and reinstall both Excel Viewer 2003 and the Office Capability Pack.

I hope one of these solutions works for you.

Solve given problem by the using of xlsx viewer

You may also apply XLSX Viewer Tool

Both solutions are find on http://www.xlsx.viewertool.com/ article

regedit
HKEY Current USERS
Software
Classes
..xlsx
right click on default and hit
then reassociate file with viewer