Sometimes, when I drag-and-drop a sample from FL Studio (using its default D&D) to Audacity, Audacity does not load the sample, does not show the “Audacity did not recognize the type of the file” message, and refuses to exit/close.
And when I try to import the same sample using any method in Audacity, Audacity crashes (sometimes with a debug report), and the same thing happens even after restarting Audacity.
A debug report: Audacity_dbgrpt-5760-20180324T164012.zip (132 KB)
It looks like there is a problem with the file that you are trying to import. I’m not an expert at this, but it looks like Audacity is attempting to import a WAV file with libsndfile, which should work for a valid WAV file, but that fails, so Audacity then attempts to import the file with FFmpeg, but when FFmpeg tries, it crashes, and takes Audacity down with it.
As a workaround, perhaps you could export the sample from FL Studio as a WAV file (which will hopefully produce a valid WAV file), and then import that into Audacity.