How to uninstall

[fwoncn]

I'm not saying i don't like this software. On the contrary, i enjoy it. However, sometimes i need to re/uninstall it.
The problem is that i always use the install way of unzipping the downloaded achive file into a certain file. So when i want to re/uninstall it, there will be a error prompt telling that some kind of .dll file is under use.
So would you tell me how to uninstall XnView in my case, please?

[XnTriq]

The file in question is probably \XnView\ShellEx\XnViewShellExt.dll.

You need to untick the checkbox for Use XnView Shell Extension (Tools » Options... » System Integration » Integration).

[fwoncn]

thank you
but still hope to have a uninstaller