# Modify compressed file error

**URL:** <https://forum.kx.com/t/modify-compressed-file-error/8934>\
**Category:** Community Support\
**Tags:** kdb-and-q\
**Created:** [July 11, 2014, 9:39am UTC](https://forum.kx.com/t/modify-compressed-file-error/8934 "2014-07-11T09:39:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![skuvvv1](https://avatars.discourse-cdn.com/v4/letter/s/7ba0ec/32.png) [@skuvvv1](https://forum.kx.com/u/skuvvv1)\
**Post date:** [July 11, 2014, 9:39am UTC](https://forum.kx.com/t/modify-compressed-file-error/8934/1 "2014-07-11T09:39:00Z")

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Hi. Does it normal getting error “Access Denied” when I try set compressed file like in this example:

.z.zd:(16;2;1)

`:g:/db/t/ set ( ti:09:30:00 09:30:01 09:30:02; p:33 33.5 33.2)

`:g:/db/t/p set @[get `:g:/db/t/p;1;:;42.]

\l g:/db

ps I can set to different temporary file, delete old file and rename temporary file to avoid error.

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**Author:** ![charlie1](https://avatars.discourse-cdn.com/v4/letter/c/ec9cab/32.png) [@charlie1](https://forum.kx.com/u/charlie1)\
**Post date:** [July 11, 2014, 9:42am UTC](https://forum.kx.com/t/modify-compressed-file-error/8934/2 "2014-07-11T09:42:00Z")

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yes, that’s expected for the windows build.