Sometimes, I like to email clients a PDF copy of an invoice, the default filename of downloadable PDF's I do not think are very descriptive.
Currently if you download a PDF invoice it will be named "Invoice-XXXXX" but I think it would be better if the default name was changable to something like "MyCompany-Invoice-XXXXX".
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I'm pleased to advise that in v5.1 this was implemented. The following language strings can be used to customise the Invoice PDF and Quote PDF filenames:
$_LANG['invoicefilename'] = "Invoice-";
$_LANG['quotefilename'] = "Quote-";
Related documentation: http://docs.whmcs.com/Language_Files#Overriding_Language_Strings