Attaching docx file

The following configuration is done for Contact form 7. For file attachment it is accepting all the file formats (tested for even xlsx and pptx) except “docx”. Need solution !

<label> Your Name (required)
[text* your-name] </label>

<label> Your Email (required)
[email* your-email] </label>

<label> Your Phone (required)
[tel tel-404] </label>

Your current industry
[select menu-507 include_blank “Manufacturing (Domain)” “Services (Domain)” “Finance (Domain)” “Information Technology department” “Internal Management / Technology Solution implementation team” “Business Application / Software Product ” “Systems Integration” “Implementation Partners – Business Application Software” “Management Consulting” “Business Process Outsourcing ” “Knowledge Process Outsourcing” “Custom Development Companies” “Analytics Solutions implementors” “Mobility Solutions implementors” “Web Technologies Solutions implementors” “IT Enabled Services” “Call Centres” “Internet / E-Commerce” “Software Testing” “Infrastructure Services”]

Your Experience
[radio radio-497 default:1 “Fresh” “1-4 years” “4-12 years” “12-20 years” “20+ years”]

<label> Subject
[text your-subject] </label>

<label> Your Message
[textarea your-message] </label>

Your Profile
[file file-677 filetypes:html|txt|gif|png|jpeg|jpg|tiff|bmp|ai|eps|ps|rtf|pdf|doc|docx|zip|rar|ppt|pptx|xls|xlsx]

[submit “Send”]