Cannot Open MS Excel file by double-clicking on it (MS Excel 2007)

One of our managers is always getting this error when double-clicking an Excel file or opening it in the Recent Documents:

"Cannot find the file C:\ My Documents\file.xlsx (or one of this components). Make sure the path and filename are correct and that all required libraries are available."

I tried to re-install MS Office but it didn't work. I searched in Google and found this solution:

Steps:
1. Open MS Excel 2007.
2. Click on the Office Button in the upper left part of the Excel window.It looks like this:

3. Click on Excel Options then Advanced.
4. Look for General category.
5. Remove the check mark on "Ignore other applications that use Dynamic Data Exchange (DDE)".

6. Close MS Excel application and now you can open any Excel file by double-clicking on it.

How can i open a .docx file?

You can find the solution on the link below:

http://www.microsoft.com/downloads/details.aspx?FamilyId=941b3470-3ae9-4aee-8f43-c6bb74cd1466&displaylang=en

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats

Brief Description

Open, edit, and save documents, workbooks, and presentations in the file formats new to Microsoft Office Word, Excel, and PowerPoint 2007.

Overview

Users of the Microsoft Office XP and 2003 programs Word, Excel, or PowerPoint—please install all High-Priority updates fromMicrosoft Update before downloading the Compatibility Pack.

By installing the Compatibility Pack in addition to Microsoft Office 2000, Office XP, or Office 2003, you will be able to open, edit, and save files using the file formats new to Word, Excel, and PowerPoint 2007. The Compatibility Pack can also be used in conjunction with the Microsoft Office Word Viewer 2003, Excel Viewer 2003, and PowerPoint Viewer 2003 to view files saved in these new formats. For more information about the Compatibility Pack, see Knowledge Base article 924074.

Note: If you use Microsoft Word 2000 or Microsoft Word 2002 to read or write documents containing complex scripts, please seehttp://support.microsoft.com/kb/925451 for information to enable Word 2007 documents to be displayed correctly in your version of Word. 

Administrators: The administrative template for the Word, Excel, and PowerPoint converters contained within the Compatibility Pack is available for download. 

Update: The Microsoft Office Compatibility Pack Service Pack 1 (SP1) is available here.

You need to download FileFormatConverters.exe and then install on your system.