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I am using QGIS 3.16 and Windows 10.

I have some custom CRS (cCRS). Now, I'd like to work on my QGIS Projects at another PC and want to move my cCRS there.

According to the QGIS manual the cCRS are stored in the "user database". But I cannot find any further information about filename or path of the "user database" in the manual. I also tried to search for my cCRS-names in the Explorer (search for files including content). I searched in the (typical) user and programm directories, but haven't succeeded yet.

Does anybody have an idea for me?

In response to @JGH's answer I am including a picture of my folder contents:

enter image description here

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Go to the menu settings / user profiles / open active profile folder, which by default, on Windows, should lead to something like C:\Users\yourUserName\AppData\Roaming\QGIS\QGIS3\profiles\default\

Then have a look at qgis.db and its table tbl_srs

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  • _ @JGH Thanks for your quick answer. And sorry for my late response. I ran a little bite out of the the last days. I found the the qgis.db, but not the tbl_srs. I edited my question by adding my default directory content, if you may have a look? What is the sense of the tbl_srs?
    – jaysigg
    Commented Sep 1, 2021 at 17:44
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    @jaysigg the table tbl_srs is inside the SQLlite DB qgis.db. Go the menu layer / data source manager and select Browser then go to qgis.db and add the said table. Alternatively you can use a tool such as sqlitebrowser
    – JGH
    Commented Sep 2, 2021 at 18:00
  • Ok, found it, thanks. But what you mean with "add the [tbl_srs] table"? Add to what?
    – jaysigg
    Commented Sep 3, 2021 at 5:23

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