I've come across a bug in STATA's insheet command that is quite worrisome.
Many power users will have their original datasets in raw text format. This is often the case for data coming from a variety of sources (public datasets, data downloaded or scraped from the Internet, etc). Not only it is a good habit to store data as raw text, but it also reduces lock-in with a specific platform or software. You are more likely to open that file again in 5-10 years if it's in a pure text format.
A common format for raw text files is the tab-delimited one, as tabs rarely appear in data.