[Qgis-user] .qpj files

[Nicolas Cadieux]

Hi,

When you currently save a shape file (.shp), that will also save .cpg, 
.dbf, .prj, .qmd, .shx. files also.  The minimum number of extension is 
3.  If you drag and drop all of them in the map canvas, you will get an 
error for each file that is not a .shp. This is normal.  Only the .shp 
should be opened in QGIS but the rest must be kept if you want to open 
the .shp file. If you delete the .dbf file for example, you will delete 
the database (not good!).

The .csv is a text file.  You should open that with using the delimited 
text file importer (the comma in the Manage Layer toolbar).  That file 
is possibly joined to a field in the shapefile via Layer properties, 
joins.  You can open that one with any plain text reading program like 
notepad. or notepad++.

Like Nyall says, some are no longer needed (the projection file format 
had some work around) but I would keep them all just in case. The 
shapefile format is very old.  Any version of QGIS can open one but 
select the .shp.

Nicolas


On 2021-09-07 7:56 p.m., Nyall Dawson wrote:
> On Wed, 8 Sept 2021 at 09:52, Pat Brown <mistyhaven at gmail.com> wrote:
>> I have a number of these files, associated with .cpg, .prj, .shp, .shx, .csv and .dbf files. These date back to 2019. I cannot seem to get them to open in QGIS version 3.18. Do I need to first open them with an older version of QGIS?
> They aren't needed anymore. They were an old workaround around getting
> QGIS to correctly identify the projection of the shapefiles, but all
> that logic is moved to the PROJ library and these files are no longer
> required.
>
> Nyall
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-- 
Nicolas Cadieux
https://gitlab.com/njacadieux