http://www.zwsoft.com/forum/viewthread.php?tid=2567 [i=s] Post Last Edit by aluminu at 2013-1-11 09:12 [/i] When I open files using Windows Explorer they open in individual windows (instead of tabs in one window). Is there a setting somewhere to get files to open as tabs? Or is this a bug? Opening files from within ZWCAD+ behaves as expected (using tabs). I'm running ZWCAD+ Pro SP1 on Windows XP Pro SP3. Thanks for any help! Looks like this only happens with DXF files. I can open DWGs all day long and they open in the same window but opening a DXF will launch a new window. aluminu 2013-01-11 06:19:57 http://www.zwsoft.com/forum/viewthread.php?tid=2567&pid=16914 Hi, you can try following solution: Click Windows Start menu, Run "Regedit" to open register, find:HKEY_CLASSES_ROOT\.dxf, change the default setting to "ZWCAD.Drawing.2012" huangy8949 2013-04-01 11:07:22