100,000+ page collection on pdf, some show no text.

i have on 100,000 pages of automotive parts , repair manuals on pdf in on 100 folders on external drive g:. got new computer , wanted transfer these on clean names , folder organization. doing organizing on drive g: , of files don't open. when right click on them can't properties box. can't copy them individually since when right click don't "copy" option, able copy folder contains group of them , can open pdf there has strange shortened name.  example have title of 1 400 page pdf file on drive g: as: "1997 dodge intrepid, chrysler concorde, lhs, hew yorker, eagle vision (lh) parts manual" , have 1 file each year 2004 in folder. nothing happens when click on 1 of them. if copy entire folder drive c: can access each 1 name has changed "1997do~1" example. , when try rename was, after 15 or characters wont let me type more. whats going on here? why can't access these files? did corrupted when moved them around on g:?

looks problem of microsoft windows.

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