I was downloading a program from the net internet and when downloading the file, comes a compressed file i.e. zipped file. After extracting all the files I click the icon which initiates download and it says "You are attempting to open a file of a type "Application Extension' (.dll). It meant that these files are used by OS and editing them would damage your system. What are .dll files? Why is this happening? Why am I not able to Open it?
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