html - Why .doc automaticly downloads, but not shown in <iframe>? -

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the problem - when input url .png or .pdf has been shown in iframe>. can scroll it, read etc. when insert url has docx or xls file (ex. "http://www.exampleimage.docx") - automatikly aploads browser, , not shown in iframe>.but want see content of .docx file in iframe pdf. or search guys?

here part of code:

 <iframe   src={{attachmenturl}} width="468" height="468" frameborder="0">     click on attachment please. </iframe>


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