HP41CX - Naive' question - "Current File"

[rprosperi]

(12-17-2022 09:33 AM)J-F Garnier Wrote:  I'm surprised nobody seem to remember that it's dangerous to have no working file with the Extended Functions module 1B.
From the Ext-Fcn manual Addendum 82180-90026, April 82 (not on Eric's site, but can be found elsewhere ...):
"After a file in extended memory is purged, there is no working file.
[...] you should always define a working file before executing functions that operate on it;
otherwise, all files in extended memory will be lost".

Thanks J-F, I certainly did not recall this particular warning's effects, but it may be because of this effect that I recalled some functions can leave it undefined??

Was this bug fixed in the 1C version included in the CX, or did they simply add the warning into the User Manual (no longer requiring an addendum)?