My previous review gave STDU Viewer a high rating, but unfortunately after discovering a lot of instability and PDF rendering flaws I've had to change my mind. If you want the app for PDFs, there are much better options out there that are faster and less bloated than Adobe's reader, as well as smaller in size and free.
By instability I'm referring to frequent crashes on my Windows 7 system, not only in the browser feature and the loading of some PDF documents, but also when trying to open the Paragraphs and Fonts section of the options dialog for text documents.
As for STDU Viewer's PDF rendering, I've seen much better quality in Sumatra PDF. In particular, I find STDU's display of music scores inaccurate and slow by comparison.
If you want just a small application to read ebooks or pdfs in addition to viewing some popular image files then this is the app for you. STDU Viewer is good for people who are not into organizing their files and just want to view them. It can view tiff, pdf, fb2, fb2.zip, pcz, dcz, djvu, cbr, cbz, test, wwf, azw, xps, jbig2, jb2, tcr, pdb and epub. I would not take points away from it just because it can't read MS word docs or any other word processing file because it's not that type of viewer. Why would anyone expect it to read doc-type files is beyond me. It can just be used as a quick viewer and is comfortable enough to be used as a main viewer. Very light program and available as a portable version, too. Not very feature rich, but sometimes simplicity is best.
I needed a program to open an XPS file. This did the trick. I'm glad to have it. Easy to use.
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