# Having problem with Flash extension files

**URL:** <https://forum.kirupa.com/t/having-problem-with-flash-extension-files/93186>\
**Category:** Uncategorized\
**Created:** [October 27, 2003, 9:01am UTC](https://forum.kirupa.com/t/having-problem-with-flash-extension-files/93186 "2003-10-27T09:01:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fred](https://avatars.discourse-cdn.com/v4/letter/f/db5fbb/32.png) [@fred](https://forum.kirupa.com/u/fred)\
**Post date:** [October 27, 2003, 9:01am UTC](https://forum.kirupa.com/t/having-problem-with-flash-extension-files/93186/1 "2003-10-27T09:01:27Z")

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heya I’ve got a problem with Flash MX 2004, I bought the Studio MX 2004 package recently and got Flash MX 2004 installed, and when I install my extension files using the Macromedia Extension Manager and open up Flash MX 2004, it just popped out an error saying “Unexpected file format”. So does anyone know how I can fix this problem? Thanks a bunch! :cap: