http://www.zwsoft.com/forum/viewthread.php?tid=2600 [color=#222222][font=arial, sans-serif][size=13px]I'm using the trial version of ZWCAD+2012 2D, as well as my collegue in Philippines. Yesterday he sent me 2 files and I was able to open only one. Today he sent me 3 files and I was able to open only 1 again. in both cases this is the message I get: " Drawing file is not valid". Can someone please help to figure out what is going on?[/size][/font][/color] [color=#222222][font=arial, sans-serif][size=13px]We are really interested in buying the program but we need to test it first[/size][/font][/color] [color=#222222][font=arial, sans-serif][size=13px]Thank you so much for your help[/size][/font][/color] gabrielab6296 2013-02-06 09:25:33 http://www.zwsoft.com/forum/viewthread.php?tid=2600&pid=16868 Hi sir, are all this drawing generated in same version of ZWCAD+? If possible, please attach the sample drawing that cannot be opened in this post, thanks! huangy8949 2013-03-28 15:48:13