here's project that when built repororts an error 42, when you then modify decNumber.c and try to save it, I get an error
decNumber can be obtained from
http://speleotrove.com/decimal/decnumber.html , I only included the files needed to reproduce the error.
Error writing to file 'decNumber.c'
The process cannot access the file because it is being used by another process.
same error if I try to exit the IDE
please try the following
(1) rebuild the project
(2) modify decNumber.c in some way
(3) try to save the file