How to read out whole static text present on external appln

Hello friend!!

I will required the whole static text present on external application's input box or message box.

For example consider Microsoft word as external application which is password protected.

Suppose my file name is "Demo.docx", when I clicked on this file the "password" input box is opened as i have already mentioned my file is password protected.

The "Password" input box will contain static information message as follows:

Enter the password to open file "C:\...\sham\desktop\Demo.docx"

So my requirement is to getting this static message present on external application's input box or message box.

Is there any way to read out this message programmatically??