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Those forms are presumably distributed in PDF file format.
If the forms are PDF format, then you need a PDF reader on your computer... one that deals well with form-fillable PDF files.
I recommend that you acquire, install, and try out FoxIt for Windows.
Here's where to download it from:
click on the FREE DOWNLOAD button, and download it to your computer, then install it.
I have used FoxIt for years, and find it preferable because of its all-round capability, plus its superior degree of control over printing and sending print jobs.
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