Hi. Thank you very much for pointing this out Ashley. <img src="smileys/smiley4.gif" border="0" align="middle" />
It seems STEAM / Construct was set to compatibility mode when it crashed last time! When I rightclick the Construct2.exe the compmode is disabled (I enabled run as Admin but the window title already showed run as admin, steam is launched with admin rights). But when I check steam.exe the use compatibility mode check is greyed out and Windows XP is set in the dropdown. I clicked on "Set for all users" and disabled it.
I created a new project and importet a .wav and it worked! I have a .wav, .ogg and .acc now. But do I need the .wav in the project or can I delete it?
Can I just re-import the existing files or do I have to delete them and add all actions for them again?