"All About PDF for Windows" isn[SQ]t a single, well-known software program. It[SQ]s more of a descriptive phrase that could refer to any of several types of PDF-related software or services for Windows. To understand what someone means when they say that, you need more context. It could be referring to :

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A PDF reader:

Many programs simply let you open and view PDF files. Adobe Acrobat Reader is the most common example, but many free alternatives exist like Foxit Reader, SumatraPDF, etc.

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A PDF editor:

These allow you to make changes to existing PDFs, such as editing text, adding images, or rearranging pages. Examples include Adobe Acrobat Pro (paid), PDF-XChange Editor (paid with a free version), and others.

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A PDF creator:

These allow you to convert other file types (like Word documents or images) into PDFs. Many office suites (like Microsoft Office) include this functionality, and there are standalone applications as well.

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A suite of PDF tools:

This could be a single program offering a combination of reading, editing, creating, and other PDF-related functionalities.

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A website or tutorial:

The phrase might refer to an online resource that explains various aspects of working with PDFs in Windows.

To get a clear answer, you[SQ]d need to provide more information about where you encountered this phrase. For example:

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Where did you see or hear this phrase?

(A website, a software description, an advertisement, etc.)
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What was the context?

(Were they talking about software, a tutorial, a service, etc.?)

With more details, I can give you a more precise answer.