some tools to manipulate .t64 files (written in C++)
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newt64.com - makes an empty .t64 files

prgtot64.com - copy raw binary files to .t64 files
(supports wildcards & multi-file tape images)

t64toprg.com - converts one-file tape images back to binary raw format
(supports wildcards)

t64sort.com - alphabetically sorts the directory of .t64 files
(supports wildcards & multi-file tape images)