[meslgh]

I'm totally new to Calibre. I've had no problems adding books and editing metadata. Now, when I try to view a book, I get the following error message:

ERROR: ERROR: Unhandled exception: <b>WindowsError</b>:[Error 1155] No application is associated with the specified file for this operation: u"C:\\Documents and Settings\\Marian\\Calibre Library\\Kuffner_ Trish\\The Preschooler's Busy Book_ 365 Creativ (9)\\The Preschooler's Busy Book_ 365 Creativ - Kuffner_ Trish.azw"

Traceback (most recent call last):
File "site-packages\calibre\gui2\actions\view.py", line 135, in view_book
File "site-packages\calibre\gui2\actions\view.py", line 170, in _view_books
File "site-packages\calibre\gui2\actions\view.py", line 47, in view_format
File "site-packages\calibre\gui2\actions\view.py", line 90, in _view_file
File "site-packages\calibre\gui2\actions\view.py", line 81, in _launch_viewer
File "site-packages\calibre\gui2\__init__.py", line 656, in open_local_file
WindowsError: [Error 1155] No application is associated with the specified file for this operation: u"C:\\Documents and Settings\\Marian\\Calibre Library\\Kuffner_ Trish\\The Preschooler's Busy Book_ 365 Creativ (9)\\The Preschooler's Busy Book_ 365 Creativ - Kuffner_ Trish.azw"


I have gotten an equivalent error message with several books (I haven't tried all of them). What should I do now?

TIA