一个C#写的小程序，用来修改exe或dll的.NET运行时版本号。比如，可以把目标为.NET fr a mework 2.0的程序修改为NET fr a mework 4.0的程序。(A small program written by C# is used to modify the.NET runtime version number of exe or DLL. For example, you can modify the program that targets.NET fr a me