if your pc opens the env file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating env file extensions with the wrong software program.

How would the previous sentence be correctly capitalized?
Answer: If your PC opens the ENV file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating ENV file extensions with the wrong software program.
black premium suede strap, 2.5-inch width. also available in brown suede (bss-25-brn).

How would the previous sentence be correctly capitalized?
Answer: Black premium suede strap, 2.5-inch width. Also available in brown suede (BSS-25-BRN).
but how should you choose a language to study? i think the first language you study should be one that will be most [...]

How would the previous sentence be correctly capitalized?
Answer: But how should you choose a language to study? I think the first language you study should be one that will be most [...]
jens bromann’s personal experience with the international scene of disabled sports is the background for the establishment of the company in 1987.

How would the previous sentence be correctly capitalized?
Answer: Jens Bromann’s personal experience with the international scene of disabled sports is the background for the establishment of the company in 1987.