From Forum Nokia Wiki

Emulator does not have direct option to uninstall an application from it. Thus it becomes difficult to delete the application from the emulator. Here are some of the possible ways to uninstall the application from the emulator.

Primary method

• Goto current directory of your project and run command ..\projectname\group>abld clean winscw
  
• This step will ideally remove the application from the emulator and thus you will not see the application icon on the emulator.

Alternate method

• If the above method does not work for you then only try this alternate method.
• Remove the files manually from the file system. Delete the following 4 files manually from Epoc32.
  

..\epoc32\release\winscw\udeb\appname.exe
..\epoc32\data\z\resource\apps\appname.rsc
..\epoc32\data\z\private\10003a3f\import\apps\appname_reg.rsc
..\epoc32\data\z\resource\apps\appname_aif.mif"

Note: You can also remove it by deleting any files in Epoc starting with your application name, but you have to make sure that only project specific files should be deleted after a careful inspection.

A quickest way could be, from the command prompt into the ..\epoc32 directory to do the following :

del appname*.* /S

to delete the specified file(s) from the current dir to all subdirectories.