how to change filetype?

[lizhx]

i have a file "a.mp3"
but i want wo change it to "a.asf"(not in convert,only to change the file
header and extent)

how to?

thanks

 

[ShaneB]

I believe you are looking for the Path.ChangeExtension (System.IO
namespace).

ShaneB

 

[Arne Schittenhelm]

i have a file "a.mp3"
but i want wo change it to "a.asf"(not in convert,only to change the file
header and extent)

how to?

thanks

To change file extensions this works well

string newFilename = openFileDialog1.FileName;
newFilename = newFilename.Substring(0, filename.LastIndexOf(@".")) +
".asf";
File.Move(openFileDialog1.FileName, newFilename);

 

[ShaneB]

For some reason I thought he was just trying to change the filename as a
string...it's early here Combining with Arne's code, we get:

string newFilename = openFileDialog1.FileName;
File.Move( openFileDialog1.FileName,
Path.ChangeExtension(openFileDialog1.FileName, ".asf") );

ShaneB