I am unable to open any files/ programs

You can be getting an error notice when attempting to export Tally data in Excel format for a number of reasons.
You might attempt the following troubleshooting steps:

If you're trying to save the Excel file somewhere, be sure you have the right rights.
You might not have the required permissions to save the file if you are attempting to save it in a restricted place or on a network disk.
Try storing the file somewhere else, such your desktop or another folder.

Make sure you have enough space on your hard drive to save the file.It might not be possible to save the Excel file if your hard drive is full or nearly full.
Try removing unnecessary files or programs to free up some disk space.

Verify the file name and path for any special characters.
While saving the file, issues may occur if the file name or path contains special characters like slashes or colons.
Change the file's name while avoiding special characters.

Check to see if the Excel file is open already.
It might not be possible to save the file if it is open in another program or instance of Excel.
Close any open Excel windows, then try exporting the file once more.

A different format might be tried for the file's export.
Try exporting the file in an other format, such as CSV or PDF, if you are unable to save the file in Excel format.

If none of these fixes the problem, you might need to contact Tally support or your IT department for more help.

Excel file can be repaired manually if it is less corrupted but Open and Repair program doesn't work if highly damaged due to corruptions. I searched for solutions to repair corrupt Excel file and found one solution which is full of information and provides a guaranteed solution. I am sharing this solution with all the users -Excel Repair Toolbox. Follow the exact steps given in this programm and you will be able to access the data. Download Microsoft Excel Repair tool

You can open the program first then in the file tab click open and search the file on your computer. If that's what your doing then the file might be currpt and it might not be wise for it to be open anyways as it might contain malicious factors

1. Click Start.
For Windows XP, click Run and then click in the Open box.
For Windows Vista, click in the Start Search box.
For Windows 7, click in the Search programs and files box.
2. Type appwiz.cpl and then click OK.
3. Select the Microsoft Office 2010 suite you want to repair and then click Change
4. Select Repair, and then click Continue. You may have to restart your computer after the repair is completed.


excel formulas

How to Crack Excel Spreadsheet Passwords by Petri IT Knowledgebase Team - January 8, 2009 Often when an employee departs, they take important Excel passwords with them. This guide outlines how to use a simple Excel password recovery application to crack lost or forgotten passwords, allowing you to unlock password-encrypted Microsoft Excel documents quickly as possible.
Step 1: Download and Install the Office Password Recovery Utility To perform the following recovery steps, you'll need to grab the download of Office Password Recovery Pro, available directly here. (2.1Mb)
Once you've downloaded the program, run the install with the default options.
Step 2: Navigate to the Protected File and Begin the Recovery Process Click the Open button on the top left, navigate to the protected spreadsheet file:

probably the file is corrupted.
search in google if there is any program to cure the file or do another think, get this file to another pc/laptop and try if it opens there.

I was sent an excel file (.xls). friends on mac and pc can both open it.

i am on mac and keep getting unable to read error. it must be something with my mac. what could it be? nobody else has this problem.

Excel Password Remover 2008

Excel Password Remover
Instructions
FAQ
Disclaimer
Excel Password Remover PRO

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Recommended links:
Password recovery software (Word, Excel, Outlook, Exchange, Visual Basic modules, Access, Winzip, Lotus 1-2-3, Lotus Organizer, Lotus Wordpro, Backup, Project, FileMaker, Schedule+, Money, Paradox, Act!, Mail, Windows NT)
Instant password recovery (Instant online recovery service for password protected MS Word and Excel files. Free online preview of encrypted file content. )
Visual Basic Password (Instant recovery of VBA-passwords in Office programs)
Excel add-in decompiler (Converts Excel add-ins into normal workbooks)

Have you ever forgotten your Excel workbook or sheet password?
Here you can download a FREE Excel add-in that removes/cracks sheet and workbook password protection in Excel®.
NB! This program can't remove file protection, i.e. if you are unable to open the file, this program won't help you. You could try Excel Key to remove file protection. If you need to crack the VBA-password try this one.
This Excel add-in (password.xla) works fine in Excel 5.0 and above (including Excel 2000, XP and 2003).
This program will remove passwords of any length, also passwords containing special characters.
Download here: password

Try to Recover Excel Password with Excel Password Recovery 5.0. I have searched MS Excel Password Recovery, found this efficient Excel Password Recovery program. It supports all versions through 97 to 2007.
Remark:
Office Password Recovery tool also can help! It recovers Password to Open and removes both the Password to Open and Password to Modify for Microsoft Word, Excel, Access and PowerPoint of versions through 97 to 2007.

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.