Also using GoldED 8 SP 10 here, this time on MorphOS 2.2.
The Ambient-Shell is given back, so this isn't reproduceable here, but the opening bug/feature. And in both Cubic IDE and microgolded. And even worse, the filename can be appended by one character (not limited to numbers, just any alphanumerical char fits) *or* can be reduced by one character *or* the last character can be changed to any alphanumerical character (also in reduced form), everything opens the same file.
So the file 'test' can be opend by all these filenames:
test
test1
testz
tes
tes1
tesz
te1
tez