You need to add something like:
win32:RC_FILE = application.rc
into your .pro file. The text file application.rc may contain the following information, including an icon:
IDI_ICON1 ICON DISCARDABLE "resources/Email.ico"
VS_VERSION_INFO VERSIONINFO
FILEVERSION 0,4,0,0
PRODUCTVERSION 0,4,0,0
FILEFLAGSMASK 0x3fL
FILEFLAGS VS_FF_DEBUG
FILEFLAGS 0x0L
FILEOS VOS__WINDOWS32
FILETYPE VFT_DLL
FILESUBTYPE 0x0L
BEGIN
BLOCK "StringFileInfo"
BEGIN
BLOCK "040904B0"
BEGIN
VALUE "CompanyName", "My company\0"
VALUE "FileDescription", "My application\0"
VALUE "FileVersion", "0.4.0.0\0"
VALUE "LegalCopyright", "Copyright (C) 2010-2014 John Daw (email@mail.com)\0"
VALUE "OriginalFilename", "application.exe\0"
VALUE "ProductName", "My Application 0.4\0"
END
END
BLOCK "VarFileInfo"
BEGIN
VALUE "Translation", 0x409, 1200
END
END
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