Executable files may, in some cases, harm your computer. exe extension on a filename indicates an executable file.
The NetCat source code is free and widely shared so there are many potential versions and some trigger antivirus warnings, although these may be false. NetCat's bare-metal TCP/IP port-level access is useful for testing a network but opens possibilities for abuse. (A modern freeware version is called "winnc.exe".) Because these made "nc.exe" a popular name, it appears to be a popular imitation name for malware. An early well-known MS-DOS freeware program called "Norton Commander" also existed for managing files. It can usually be uninstalled by looking for "Network Control" under "Uninstall a Program" in the Control Panel. It gives network administrators a "Swiss army knife" for testing TCP/IP connections and ports. In 1995, someone called "hobbit" created NetCat for Unix and used the name "nc.exe" Rodney Beede later adapted it to Windows NT (and later), where it needs the Minimalist GNU for Windows (MinGW) for an underlying Unix/Linux platform.
The genuine nc.exe file is a software component of NetCat Network Control Program by Rodney Beede.
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