CppSupport: Using upper-case extensions on OSX seems to irritate QC

Steps to reproduce:

• create an application from template or add a C++ class to a given project
  • use .H as extension for the header and .cc for the extension of the source
• open the header file (to have it opened at least once)
• open the source file and trigger 'Switch between Header and Source'

Current result:

• QC opens the respective header but the header is now displayed with a .h extension (lower-case instead of upper-case) inside the 'Open Documents' view
• the navigation view (Projects) still displays the doc with .H extension
• changing the .h file triggers a message box of 'XYZ.H has changed outside QC...'

Note: I've checked the directory and there's only the XYZ.H created.

Additional note: Not sure if related: using .CC instead of .cc for the source does not trigger the 'Switch Header/Source' at all (on all platforms) but behaves similar to the above result - it "switches" to the same source file but now listed with lower-case extension. (on Linux nothing happens at all)