Error to export file in excel

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What steps will reproduce the problem?
1.When trying to export excel file to a folder

What is the expected output? What do you see instead?
Expected : When I will open the excel file I wont get any error.
Actual : My page using paging. If I export the whole table, I am not getting
any error to open the file.But if I export 10 records out of 20, I am getting
error while opening the excel file. The error is :

"Excel found unreadable content in ‘filename.xls’; do you want to recover
the contents of the workbook? If you trust the source of this workbook, click
yes"

What version of the product are you using? On what operating system?
I have downloaded ExcelLibrary_20110414.zip file

Please provide any additional information below.

The page that we are using to export as an excel file is having a facility
where you can choose to see 10 or 25 or 50 or 100 records at a time.....I mean
if you choose 10...and if you have 20 records it will show next/previous button
to see the rest of the records but if you choose 25...it will display all
records in one page....I think it’s a pretty simple paging concept, now when
I am displaying all records and exporting it to a folder, I am not getting any
error, I am only getting error when I am displaying 10 records out of 20 on a
page and trying to export the file
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Original issue reported on code.google.com by `sanhitam...@gmail.com` on 17 Jun 2011 at 9:59

Reproduce the export with ExcelLibrary_20110414.zip using 20 records while displaying 10 per page, then compare it with exporting all records. Inspect the generated .xls for the cause of Excel's unreadable-content warning; done when a partial-page export opens without a recovery prompt.

Written by the indexing model from the issue text.