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Here you may find lvserial library for serial communication. I used it once in application with high performance requirements. Additional advantage is that you don't have to include NI-VISA installer...

There are a variety of formats supported by PNG, my version of the PNG suite contains 157 different files. The File-based VIs will handle 154 of the 157 files. The string-based one will handle 59 of the 157. Clearly NI has written/licensed a nearly compliant PNG reader, why it is not using the same one in both cases is beyond me. I was annoyed when I first saw the string based VIs hidden deep in the palettes (having written my own). After some quick testing the crappiness (technical term) was soon apparent so I was glad to have made the effort. The simple .NET solution may be an option for you if you are on a Windoze machine.