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Saving a file, document or other electronic format back to an previous version of that program. This feature is usually accessed via the "Save as" prompt in most applications.

(Origins- retro and save: "Retro-pertaining to a style of an earlier time", "Save-to electronically copy a file from RAM onto disk or other storage medium)
"I do not have Photoshop CS3, so I can not open your .PSD. Can you retrosave it to Photoshop 7?"

"The file '_____.docx' can not be opened as you do not have the latest version of MS Office. Please have the sender Retrosave it to an earlier version of MS Word."
by jkleinrichert August 06, 2008
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