I'd like to propose the following standard for file browser widgets:
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# File Browser Widget Standard
Users should be able to choose and customize file browser dialogs to fit
their needs. Currently users have multiple file browser dialogs they
need to customize, and some that they are unable to customize due to
being straight-up hardcoded. This specification is meant to solve that
particular accessibility nightmare.
This specification proposes xdg-settings default-file-browser to select
an application for file browser dialogs. The value must be the name of a
desktop entry as defined in the "Desktop Entry Specification", with
groups defined in this specification. This specification defines the
groups [File Browser] and [Files Browser]. A compliant application must
declare both. If an application only declares one or the other, it
should not be used.
## The [File Browser] group
The [File Browser] group is used when the user needs to select a single
file. This should be used when saving a file, or opening a file in an
application that can't handle multiple files.
The [File Browser] group must have an Exec key containing a single %u to
be used as the default selected path. If no particular default path is
desired, a single hyphen-minus, "-", should be used.
The Exec command must output the full path of the user's selection to
stdout, and exit successfully. A non-successful exit indicates that the
user closed the dialog or canceled the operation.
## The [Files Browser] group
The [Files Browser] group is used when multiple files may be selected at
once. This should be used when opening multiple files at once is possible.
The [Files Browser] group must have an Exec key containing a single %U
to be used as the default selected paths. If no particular default path
is desired, it should be omitted. In particular, a single hyphen-minus,
"-", should not be used.
The Exec command must output the full paths of the user's selection to
stdout, NUL-separated and optionally NUL-terminated, and exit
successfully. A non-successful exit indicates that the user closed the
dialog or canceled the operation.
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