# Flash CS5.5 compatibility with version 5.0

**URL:** <https://forum.kirupa.com/t/flash-cs5-5-compatibility-with-version-5-0/322579>\
**Category:** flash\
**Created:** [May 26, 2011, 2:13am UTC](https://forum.kirupa.com/t/flash-cs5-5-compatibility-with-version-5-0/322579 "2011-05-26T02:13:19Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![AnnieCanoe](https://avatars.discourse-cdn.com/v4/letter/a/919ad9/32.png) [@AnnieCanoe](https://forum.kirupa.com/u/AnnieCanoe)\
**Post date:** [May 26, 2011, 2:13am UTC](https://forum.kirupa.com/t/flash-cs5-5-compatibility-with-version-5-0/322579/1 "2011-05-26T02:13:19Z")

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My artist just upgraded to Flash CS5, and ended up with Flash CS5.5.

I’ve got Flash CS5, and can’t read his files.

_“The document ‘blahblahblah.fla’ was created with ‘Adobe Flash Professional CS5.5’ and cannot be opened in this version of Flash.”_

Did Adobe really bollix up the normal convention of software version numbering(#.001 - #.999 signifies compatibility) or is there something else going on?