when I use "dte2.openfile(null,docfilename)" open my-self file,how to hide the file in the Solutions Explorer

   Now, I add a command to the soulution node, the command's function is to open my-self file, I use "dte2.openfile(null,docfile)", it can open my-self file, but when the file opened, it will appear in the solutions Explorer,

shown in the picture , in the solutions Explorer ,there will apeear the opened file "杂项文件" and the "ViGET_V2141.netconfig"

I do not want the file appear in the solutions Explorer, how I do it . Thanks very much!<link href="chrome-extension://bicdefpoleoohkhgcbbhambpghigfeid/build/index.css" rel="stylesheet" />