If we have a web parts that stores Resources like language files or images in its RESX files we can save these files to the virtual server where we need to install the Web part in two ways;
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If the DLL is placed in \inetput\wwwroot\Bin then and place the Resource files in Virtual Server \inetput\wwwroot\wpresources directory.
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If the DLL is placed in the GAC. Then the Resource files must be places in <local drive>C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\wpresources directory.