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Details on file:

My data attributes have these properties

> str(for.ana@data)
'data.frame':   994 obs. of  14 variables:
 $ gr.for     : chr  "Peupleraie" "Érablière à sucre pure ou à feuillus" "Érablière à sucre pure ou à feuillus" "Érablière rouge" "Érablière rouge" ...
 $ SUP_nrm    : num  0.388 0.388 0.388 0.388 0.388 ...
 $ FORME_nrm  : num  0.413 0.632 0.444 0.75 0.464 ...
 $ RAR_nrm: num  0.116 0.116 0 0 0.116 ...

The only value that shows up in the exported file when I open it in QGIS is Peupleraie (i.e. the one without accents).

Here is more information on the shapefile I want to export.

new("SpatialPolygonsDataFrame"
    , data = structure(list(gr.for = c("Érablière à sucre pure ou à feuillus", 
"Érablière à sucre pure ou à feuillus", "Érablière rouge", "Érablière rouge", 
"Érablière à sucre pure ou à feuillus"), SUP_nrm = c(0.387667865408362, 
0.387667865408362, 0.387667865408362, 0.387667865408362, 0.387667865408362
), FORME_nrm = c(0.41326538523008, 0.632328804567057, 0.444390436010826, 
0.749753344765862, 0.46396738636008)), .Names = c("object_ID", 
"gr.for", "SUP_nrm", "FORME_nrm"), row.names = c(175L, 150L, 
671L, 522L, 168L), class = "data.frame")
    , polygons = list(<S4 object of class structure("Polygons", package = "sp")>, 
    <S4 object of class structure("Polygons", package = "sp")>, 
    <S4 object of class structure("Polygons", package = "sp")>, 
    <S4 object of class structure("Polygons", package = "sp")>, 
    <S4 object of class structure("Polygons", package = "sp")>)
    , plotOrder = c(4L, 2L, 5L, 3L, 1L)
    , bbox = structure(c(319443.511198756, 5046058.007804, 321702.427432819, 
5048250.11169816), .Dim = c(2L, 2L), .Dimnames = list(c("x", 
"y"), c("min", "max")))
    , proj4string = new("CRS"
    , projargs = "+proj=tmerc +lat_0=0 +lon_0=-73.5 +k=0.9999 +x_0=304800 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs"
)
)

(I can't share the shapefile because it is proprietary)

I'm fairly certain that the problem is not when I upload the files in QGIS and issues with encoding. I've set endoding to UTF-8 and it's not just the characters with accents that disappear, it's the entire cell.

When I run into encoding issues, it looks more like this example with correct UTF-8 on the left and incorrect System on the right:

When I run into encoding issues, it looks more like this example with correct UTF-8 on the right and incorrect System on the left:

When I run into encoding issues, it looks more like this example with correct UTF-8 on the left and incorrect System on the right:

I'm fairly certain that the problem is not when I upload the files in QGIS and issues with encoding. I've set endoding to UTF-8 and it's not just the characters with accents that disappear, it's the entire cell.

When I run into encoding issues, it looks more like this example with correct UTF-8 on the right and incorrect System on the left: