Re: MPLABX newbie question
There are issues with some versions of MPLAB X combined with some versions of XC8.
You may try with an older version of XC8, e.g. XC8 v2.10
or a newer version of MPLAB X, (e.g. newer than v5.45 is not there yet).
See the screen capture in message #2:
different versions of XC8 are installed in different directories.
This is in connection with changing both XC8 and MPLAB X changing from 32 bit to 64 bit build.
Each version of XC8 know where include files are stored,
but the C language parsing stuff in MPLAB source code editor cannot always figure out what to use.
About Windows XP,
Microchip have stopped testing new versions of MPLAB X on Windows XP,
so you may rather figure out vhat versions work together, and stay with that.
Although WinXP is able to run 64 bit images, there will be issues with installations and java versions,
and it will break without developers knowing, or beeing willing or able to fix it.