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Years ago, the game developers for MapleStory chose to protect their game client using an anti-tamper software called Themida. Themida was used for MapleStory to prevent hackers and reverse engineers from creating MapleStory hacks and private servers, but was eventually cracked by a group of experts.

Themida as an anti-tamper software is so good, however, that many viruses are also "packed" with it, so that anti-viruses wouldn't be able to "unpack" the viruses to detect if they were malware or not. Eventually, it was decided by the anti-virus community that files packed with Themida would be automatically assumed as suspicious, due to the amount of Themida-packed viruses roaming about the Internet.

You may ask then, "how did certain legitimate Themida-packed game files, such as the official MapleStory game files, get past anti-viruses?" Nexon was able to get their original MapleStory files past anti-viruses by digitally signing their clients with a trusted authority. Trusted authorities ensure that the file is from a safe source (a game company) and gives anti-virus software companies (Norton Anti-virus, for example) a whitelist of files that their customers (you, for example) can trust, regardless of any suspicious signals. This is why the original MapleStory clients, even though they were Themida-packed, had no issues with anti-viruses.

Unfortunately, since MapleStory private servers have no such trusted authorities to turn to in order to whitelist their game files, there's no real way to prevent anti-viruses from automatically detecting them as malware. So what can you do to prevent your anti-virus from deleting KiotoStory?