Hi,
according to the doc of the open command, I think the following should
work, no? ("If no filename suffix is given (as in the first example
above), gretl assumes a native datafile with suffix .gdt.")
<hansl>
nulldata 10
store dummyfile.gdt
clear
open dummyfile.gdt
clear
open dummyfile # fails
</hansl>
This is with 2025b, not a newer snapshot.
thanks
sven