[abrogard]

I just bought a kindle book for my kindle for pc and I can't read it in calibre. get this message:

calibre, version 5.16.1
ERROR: Unhandled exception: <b>OSError</b>:[WinError 1155] No application is associated with the specified file for this operation: 'D:\\calibrelibrary\\Mike Lofgren\\CR!Y58HBTCKNX5597S0SAC0233CYWFV.az (17150)\\CR!Y58HBTCKNX5597S0SAC0233CYWFV - Mike Lofgren.md'

calibre 5.16.1 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.19041 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19041')
Python 3.8.5
Windows: ('10', '10.0.19041', '', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 38, 0) && DeDRM (7, 1, 0) && Package KFX (from KFX Input) (1, 38, 0) && KFX metadata reader (from KFX Input) (1, 38, 0) && KFX Input (1, 38, 0) && Set KFX metadata (from KFX Output) (1, 51, 0) && KFX Output (1, 51, 0)
Traceback (most recent call last):
File "calibre\gui2\actions\view.py", line 295, in view_triggered
File "calibre\gui2\actions\view.py", line 372, in _view_books
File "calibre\gui2\actions\view.py", line 324, in _view_calibre_books
File "calibre\gui2\actions\view.py", line 150, in view_format_by_id
File "calibre\gui2\actions\view.py", line 206, in _view_file
File "calibre\gui2\actions\view.py", line 196, in _launch_viewer
File "calibre\gui2\__init__.py", line 1299, in open_local_file
OSError: [WinError 1155] No application is associated with the specified file for this operation: 'D:\\calibrelibrary\\Mike Lofgren\\CR!Y58HBTCKNX5597S0SAC0233CYWFV.az (17150)\\CR!Y58HBTCKNX5597S0SAC0233CYWFV - Mike Lofgren.md'

I have installed ddrm and the kfx plugins for both input and output.

what should I do next?