Hi Aurel,
I am a little bit helpless. As I was not sure I downloaded the O2HEdit.zip file too and compared in properties the two data of the size with my original file. (53958/57344 bytes). Then I sent the file to Virustotal and got 3 warnings of 59 (BKAV, Invincea and Rising). But these are the scanners which also complain about the O2HEdit.exe file.
Maybe you have downloaded the O2Hedit.zip file too and could compare the sizes? If you send the zip file to Virustotal.com, let it check agein and get more than the 3 warnings then something in your system would have changed the file. Otherwise I can not understand this strange result for OxygenEditor.zip.
Roland