Large PPT Files Break On Download

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i set webpage allows users privileges download protected slideshows (.pptx files) fee. reason files bigger 100mb break when user on mac computer opens them after downloading. there 2 sets of files, 1 tailored towards pc users , 1 towards mac users. users on pcs don't experience issues when download pc versions of them. i'm asking here because far can tell it's issue machines downloading , not setup have download files.

there's audio , video embedded in them , original files not broken. reason seem break in process of downloading. i'm able recreate in wordpress , drupal setting, both using modules handle downloads , restrict access. in drupal i'm using private files v6.x-1.0. site on old version of drupal i'm not in position upgrade or move wordpress @ moment.

after user downloads these files , tries open them error message pops powerpoint:
"powerpoint found problem content in file (filename). powerpoint can attempt repair file. if trust source of file, click repair".

doing prompts message:
"powerpoint removed unreadable content in file (filename [repaired]).
should review presentation determine whether content unexpectedly changed or removed."

after clicking ok file opens several slides missing.

can't tell if it's matter of permissions (files set 604) or deal is. if don't understand why because smaller files (~50mb - 90mb) work fine after download.

i've tried putting them in .zip files, .tar files, changing extension .pptx .ppt no avail.

possible break when reach server, or during download process? if how go fixing or compensating issue?
 

first, please understand .pptx file .zip archive in disguise. so, zipping have no effect, , converting .ppt make file larger , less compatible.

first thing should try transfer files webserver directly mac, using protocol other web server. so, mac file using scp, sftp, etc. see if file broken. if not, in drupal or wordpress module using breaking file.

thing try temporarily put on of .pptx files in document root of apache , directly using url mac.
 


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