Wireshark portable v.2.4.3, location of the host file

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Assuming your USB drive is mounted on the D drive, the default location for personal preferences would be D:\PortableApps\WiresharkPortable\Data. This directory is set in the WiresharkPortable.ini file by setting the WIRESHARK_APPDATA environment variable, which overrides the default location, which is documented in the Wireshark man page under the "ENVIRONMENT VARIABLES" section.

Refer also to the get_persconffile_dir_no_profile() function where that environment variable is read and applied if set.

Note that if you want to change the default Wireshark PortableApps personal configuration directory, you can do so by editing the WIRESHARK_APPDATA entry in the D:\PortableApps\WiresharkPortable\App\AppInfo\Launcher\WiresharkPortable.ini file. You might want to refer to the PortableApps Environment variable substitions page for more information.