Why doc and docx losing style information in iOS?

Question

I wanted to open a docx, doc file in iOS.

I tried two ways:

1.Web view

2.QLPreviewController

In both the ways I am losing the style information associated with the document.

WHy this happens? Is in any way possible to retain the style information.

Is there any way we can retain this information?

The Style could be:

1. A table in document - displayed with doc format but not with docx format
2. Particular text in the document alone can be hightlighted with a color