Send a tiny case that demonstrates this, we can then reproduce it and debug it. > On Feb 16, 2015, at 4:54 PM, Gideon Simpson <gideon.simpson at gmail.com> wrote: > > Does petsc not distinguish lower/upper case letters in file names? I was trying to write a vector to the file “Fvec.bin”, but it comes out as “fvec.bin”. > > -gideon >