I downloaded a .pbf file from this link and then I renamed it to
tu.osm because it is an .osm file.
Then I used osmconverter to convert it to .pbf using:
c:\osm>osmconvert tu.osm --out-pbf >tu.pbf
but I receive an error:
Error: could not open input file
despite the file is 64032 kb
Why is that happening?