Got this article from The Hindu Business Line
Solution in case you are having problem in reading a book downloaded from the Internet.
"I downloaded some ebooks through the Internet. I’m unable to open some with the following extensions: .docx, .djvu, .chm.
If I open a problematic chm file, it shows a blank display, but I‘m able to open other chm files. Please suggest a solution.
In Office 2007, Microsoft has added the new Office Open XML Formats in Word 2007, Excel 2007 and PowerPoint 2007 that includes extensions such as .docx,. xlsx, .pptx, etc.
Office XML Formats use ZIP compression technology to store documents that reduce the size of Word, Excel, and PowerPoint files and improve data recovery in corrupted files. To make use of Office 2007 files such as .docx, .xlsx, .pptx etc files, a free downloadable “Office compatibility pack” (Fileformatconverters.exe of - Size 27.5 MB) is available from Microsoft.
The office compatibility pack supports the previous versions of Microsoft Office 2000, XP, 2003 and can be downloaded from http://support.microsoft.com/kb/923505.
The DjVu file format allows the distribution, on the Internet, of very high-resolution images of scanned documents, digital documents, and photographs.
DjVu achieves compression ratios that are about five-ten times better than existing methods, such as JPEG and GIF for colour documents, and three-eight times than TIFF for black and white documents.
Scanned pages at 300 DPI in full colour can be compressed down to 30 to 100 KB files from 25 MB. Black-and-white pages at 300 DPI typically occupy 5 KB to 30 KB when compressed.
To view a .djvu file, you can download Djvu Browser Plug-ins or Djvu Viewers from the Internet. WinDjView-0.5.exe (Size 508KB) is one such free Djvu Viewer windows application that can be downloaded from
Please note, there is no need to install it, you will have to only double-click WinDjView-0.5.exe.
MacDjView is a simple DjVu viewer available for Mac OS X.
The DjVu browser plug-in is also available for standard Web browsers on various platforms at this URL: http://djvu.org/resources/
The .chm file format is a compiled HTML Help file. After you install security update 896358 or Microsoft Windows Server 2003 Service Pack 1 (SP1), you may experience this problem of not being able to open HTML Help files from Internet Explorer. To resolve it, please follow any one of these two simple workarounds.
The first one is, double-click the .chm file. This will bring up an “Open File – Security Warning” dialog box.
Click to clear the “Always ask before opening this file” check box and click open.
Another method is, right-click the chm file, and then click properties.
Click the “Unblock” button and click ok. Now double-click the .chm file to open the file.
For more information, please look up http://support.microsoft.com/kb/902225.
Solution by M. Sampath"