How to force include a header file

[anda_skoa]

INCLUDEPATH+= "D:\Qt1\bin\Filewalker\Filewalker\Filewalker1"

That is now a different path than you had earlier.

Anyway, just put the header into the same directory as the cpp file.

Cheers,
_

[artt]

The header is in the same directory as cpp file.
why it is different path?

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Added after 1 14 minutes:

So are there alternatives to make custom include to works?

[anda_skoa]

The header is in the same directory as cpp file.

Then you don't need an include path, the same directory is always searched.

why it is different path?

Oh, I don't know, lets see, the first path you posted

D:\Qt1\bin\Filewalker\Filewalker\File walker1

D:\Qt1\bin\Filewalker\Filewalker\File walker1

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and then the one you posted later

D:\Qt1\bin\Filewalker\Filewalker\Filewalker1

D:\Qt1\bin\Filewalker\Filewalker\Filewalker1

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Look different to me.

Cheers,
_

[artt]

It was in the same directory since the very beginning, but I got such warning that I noted at start of my discussion in this topic. Maybe I wrongly created the .h file? How to save it corecctly in notepad?

[anda_skoa]

Notepad? Seriously?

Have you checked that the file is actually named what you think it is named?
Not something like Class.h.txt?

I can only recommend to use any form of code editor, or at least a real text editor.

Cheers,
_

[artt]

Really after browsing in 7-zip I saw that Filewalker.h.txt is really such one - so after renaming to
Filewalker.h it also showed the h-pictogram. Anyway when saving in notepad-I did not saved as textfile but as "allfiles", but I probably should also define encoding not unicode, but UTF-8.
So I should guess so -- but in working folder it is seen as Filewalker.h and as I said it was not saved as text file.