Opening session - double click on associated file - opens 2 NPP windows
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 How can I avoid it? Thanks! 
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 @Furatus777 said in Opening session - double click on associated file - opens 2 NPP windows: How can I avoid it? You might be looking for: Settings > Preferences > Multi-Instance = Default (mono-instance) Then again, if you have an association for session files, it might be calling notepad++ with the -multiInst command-line option, which overrides the Preferences. You’d have to check your Windows registry to fix that. 
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 @PeterJones Thanks a lot for your suggestion. Mono-instance fixed my problem. 
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 there should be an option in windows about mouseclicks , defining if single or double click shall open a file , maybe that caused the problem