I'm using version 10.1-64bit，I can not open the TxForm designing which inherited from TxForm in Visual Studio2012. Other configurations and settings are all set up.
Microsoft Windows 7
6.1.7601 Service Pack 1
System manufacturers： LENOVO
CPU Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz
BIOS 版本/日期 LENOVO G5ET91WW (2.51 ), 2013/1/17
Sorry for google english
If I remember correctly, Tecnomatix 10.1 assemblies are built using VS2008 with .NET framework 3.5. Though I believe this should work with VS2012, you still need to make sure that the assembly you are building uses the same .NET framework version.