
I've wondered I had some kind on DDE conflict, so I disabled DDE through registry editing and voalá! it works! =Dġ.- find subkey of file that doesn't open using double click:ġ.1- find extension you have conflict in HKEY_CLASSES_ROOT\ (ie: HKEY_CLASSES_ROOT\.xlxs) and then read data of (Default) value (ie: Excel.Sheet.12)ġ.2.- find that value again in HKEY_CLASSES_ROOT\ (ie: HKEY_CLASSES_ROOT\Excel.Sheet.12) and look inside subkey shell\open (ie: HKEY_CLASSES_ROOT\Excel.Sheet.12\shell\open) Original ideas didn't work on my pc like expected. I mixed idea of two previous solution and discussion on the web that talk about editing registry (to add quotes) and DDE conflicts with an idea of my own.

and a lot of extra software like mcafee and acrobat. Instead, I receive a message from excel that says file can't be located. When I double clicked and xlsx or xls file, excel opens but the file doesn't. I've finally solved this problem combining many ideas and editing registry.
