MikeF

Thanks. I have issues with some of the files and those files I can't play with Windows Media Player either.

I also tried your 5 step instructions but no help. In case you want to check one example file I could send it for example over email. 

...I will open a support ticket.

I am able to open .wav files with WavePad in general but now I am seeing problems when trying to open some files I used to open with GoldPlay 10+ years ago. I get error messages: "WavePad could not open the file ... for editing". First my file was named as sample1.in but it did not help even I renamed it as sample1.wav. What could be the problem? Files are 16bit mono files with Fs 8- or 16kHz.