PTeam,
While attempting to save the file using the Save As... option, I get the following behavior:
Original file name,
m45_165mm.fit
After clicking on the "Files of type:" drop-down list and selecting TIFF files in the Save Image File As dialog, I get the following result in the File name: edit box,
T:\Images\M45\165mmm45_165mm.tif
The automatically generated "file name" should be,
T:\Images\M45\165mm\m45_165mm.tif
For some reason, PixInsight Standard v01.00.55.0367 is "forgetting" to add the last back-slash separating the directory portion from the actual file name.
Wade