Is there Windows 7 software to help me search inside an EPUB file?
You can use Calibre:
- Microsoft Windows, Apple Mac OS X, Linux
- free, open source (GPL)
- can view and search inside an EPUB file:
(Sumatra PDF can view but cannot search inside an EPUB file:
Sumatra PDF can search inside EPUB files with a minimun configuration:
Go to Settings -> Advanced Settings and it opens a "SumatraPDF-settings.txt" file. In that file, just change from the original (emphasis mine):
UseFixedPageUI = false
UseFixedPageUI = true
and save it.
Next time you open an epub file, you will have a toolbar with the Find option as shown: