Thanks to Vladimir for the additional way of angle measurment possibility.

Thanks all for the great help so far, but now I have a special problem, maybe someone here can give me a tip:

My old "CAVACAD" runs under DOS and can only import *.0G and also convert DXF (Version R13) files to *.0G.
Now I get these dxf (R13) files, which I import without any problems with my old computer -from 1997 (16 bit processor)-
automatically convert into files of this program with the extension *. 0G.
The CAD program can only read these files and display them as drawings.

To be able to use "CAVACAD", which requires DOS, with the Windows 8.1 PC,
I have installed "DOSBOX", and it works (almost) completely.

The *. DXF files, previously created with the old 16-bit PC, in *. OG files can now also be imported and displayed under Windows 8.1.

But if I want to import the same DXF file as on the old PC and convert it to *. 0G with Windows 8.1 PC with DOSBOX,
I get the message:"Access denied" or "Violated protection".
I have already shared access rights, shares and owners in the folder and file properties for "everyone".
This error message only occurs with the DXF file, the same file that can be converted in the 16Bit environment without any problems.

Does anyone have any idea, what might be the reason for this?
I have to say, that all other functions of the old "CAVACAD" work fine with DOSBOX in Windows 8.1

I hope I have been able to explain this difficult matter in an understandable way.

Franz