c++ - Set an icon for a file type -

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i have used qt creator , created my.exe file , new extension ".newext" , have manually associated .newext files my.exe like this.

the exe file has icon square figure , named myicon.ico. have described in myapp.rc file icon this:

idi_icon1               icon    discardable     "myicon.ico"

also in .pro file have added line:

rc_file = myapp.rc

now when set .newext extension in registry value of defaulticon key equal 

c:\path\to\my.exe,0

then see squere icon file have associated my.exe

when set 

c:\path\to\my.exe,1

then there no icon recognized.

what set value in order see icon white paper (wrapped @ top-right corner) , on square icon - little bit made smaller?

p.s. know should possible without specifying new resource in .exe file because when vista "open my.exe always", puts icon described above (of course without changing .exe).

i don't know if possible @ all. haven't seen application doing that. have discover how windows creates these icons , run mechanism create one, associate generated icon file type. may somewhere deep inside windows.

my advise not don't this, draw own icon.


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