is it legal? decompile EXE ebook | Advice Corner | Forums

I was given an Ebook to review and it came as a .exe file.  I'm finding it a huge PIA.  I'm not very good at retaining what I read online and in this format, I can't even cut and paste to a Word doc. Plus, my nice wide screen is pitiful for making the ebook fit properly for my eyes.

I do have a license for the book, just need it in a format I can use.  Prefer Word but .pdf would even be an improvement.

Is an ebook decompiler what I want?

There are tons of even free ones on a search. Is there a way/place to look on my ebook to tell which compiler was used? It's my understanding that I have to use the same brand with which to decompile. Is this correct?

If it's allowed; if all I need is just any decompiler; please recommend one/some.

Thank you.