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On 02/07/2023 18:53, John Woodgate wrote:

I just did a simulation of a simple active filter, to look at distortion of the filtered signal, and after LTspice has closed, it has left a file called 'Filter.imp' in the schematic folder. It's 4097 KB, but LTspice won't open it. A web search suggests that it is a Adobe Audition file. I don't want to have to buy Audition! Changelog doesn't give a clue.

Try opening it in a text editor just for a look, or just try dragging it from Explorer into an open LTspice session - it would then be opened by LTspice as a text file. LTspice initially assumes everything is text unless it turns out not to be.