informix 4.x stuff & SCO Open Server Release 5

The binaries worked OK under SCO ODT 3. On OSR5, I get phenomena like a) isql not able to see all *.sql files in current directory (28 exist: it sees 25) b) r4gl not able to see all *.4gl files in current directory (5 exist: it sees 3) All the files in question are 777, same owner, same group. Granted that nobody said that 4.x was binary compatable with OSR5, I am suprised (I'm probably naive) that these programs can't read the current directory reliably. Does anybody think that there should have been a way to write their interface portably ? My filesystem type is HTFS. ---------------------------- My *real* .sig awaits future display technology