How can I convert quattro pro files qpw to work in excel?

Try Recuva.
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More then likely running System Tuneup replaced critical files that Comcast Constant Guard and Quattro Pro uses... I recommend doing the following three steps but only if you have the Original or backup copies of the installation disc/media for both applications: 1) uninstalling the Comcast Constant Guard application 2) then do a normal shutdown and reboot once it has rebooted 3) install the Comcast Constant Guard once that's done and successfully do the same three steps but for the Quattro Pro application

The free Opal-Convert Excel to vCard to Excel might work for you. Opal Convert Excel to vCard to Excel

You can check on the link below were you can download an converter for Quattro Pro spreadsheet.
Note: This is an third party program (Non Microsoft program), it might help you.
http://www.pcworld.com/downloads/file/fid,3825-order,1-page,1-c,spreadsheet/description.html
Else you can also try to downloading a trial version http://www.corel.com, open your old files, save them in Excel format

do you have microsoft office, if so you will fined it works with that program eg, excel's and word for instance check this sight out http://office.microsoft.com/en-us/excel-help/opening-quattro-pro-files-in-excel-HA001044873.aspx

donwload the cutepdf utility, search it in google.com

In Excel and even Mac Numbers, these columns can be locked and shifted around with ease by accessing the Edit > Lock feature.

In quattro pro...no idea. This was made almost 9 years ago...might be time to upgrade to something a bit more full featured.

Search for the file on the system. If it cannot be found, you will need to reinstall Quattro Pro. If the file is there, post back here with your operating system and I'll let you know how to re-register the DLL with the system. (The commands differ depending on the OS you are running.)

1. Click Start, Programs, Accessories and Run.
2. In the open window, type: regedit and click OK.
3. Choose the following path
HKEY_CURRENT_USERS\Software\Corel\User\Assistant\13\Recent Work\Quattro
Pro\
4. Right click on the Quattro Pro folder, select delete.
5. Say yes when prompted to delete the key.
6. Close the Registry Editor
7. Launch Quattro Pro

This key will be re-created when you reopen Quattro Pro. I ran into this problem when when I tried to open a QP SS on my hard drive after previously opening one from my thumb drive. Now I copy to my hard drive first.

From the Microsoft Office 2003 Web site:

Excel 2000 or later versions cannot directly open files created in Microsoft Works version 3.0 or later. To open a Works file in Excel, first open it in Works and use the Save As command to convert it to one of the file formats listed below. Then close the Works file and open the converted version in Excel.

• Works for Windows 2.0/Works for DOS SS
• Excel SS
• Lotus 1-2-3

To open a Microsoft Works database file in Excel, first save the file in Microsoft Works as a dBASE file, and then open the dBASE file in Excel.