[osgeo4w-dev] [osgeo4w] #804: Could not load qgis_app.dll - QGIS LTR 3.28.11 OSGeo4W Installer

[OSGeo4W]

#804: Could not load qgis_app.dll - QGIS LTR 3.28.11 OSGeo4W Installer
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Reporter:  ascottwwf                            |       Owner:  osgeo4w-
                                                |  dev@…
    Type:  defect                               |      Status:  new
Priority:  normal                               |   Component:  Installer
 Version:  1.0                                  |  Resolution:
Keywords:  QGIS LTR OSGeo4W scripted installer  |
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Comment (by ascottwwf):

 I have just retried this with the latest 3.28.12 LTR version (on a Windows
 10 Sandbox) and unfortunately I am still getting the same issue.

 But, I may have already discovered a fix...
 If after the install, I open a command prompt on the machine and then re-
 run:

 {{{
 %OSGEO4W_ROOT%\etc\postinstall\qgis-ltr.bat --postinstall
 }}}

 I get:

 {{{
 C:\ProgramData\OSGeo4W_v2>call "\bin\o4w_env.bat"
 The system cannot find the path specified.

 C:\ProgramData\OSGeo4W_v2>if not defined OSGEO4W_DESKTOP for /F "tokens=*
 USEBACKQ" %F IN (`getspecialfolder Desktop`) do set OSGEO4W_DESKTOP=%F
 'getspecialfolder' is not recognized as an internal or external command,
 operable program or batch file.

 C:\ProgramData\OSGeo4W_v2>for /F "tokens=* USEBACKQ" %F IN
 (`getspecialfolder Documents`) do set DOCUMENTS=%F
 'getspecialfolder' is not recognized as an internal or external command,
 operable program or batch file.

 C:\ProgramData\OSGeo4W_v2>set APPNAME=QGIS Desktop 3.28.12

 C:\ProgramData\OSGeo4W_v2>for %i in ("") do set
 QGIS_WIN_APP_NAME=%~ni\QGIS Desktop 3.28.12

 C:\ProgramData\OSGeo4W_v2>set QGIS_WIN_APP_NAME=\QGIS Desktop 3.28.12
 }}}

 It appears the command cannot correctly resolve the path, so if I change
 to the %OSGEO4W_ROOT% folder and run by calling the batch file, I get the
 same results:
 {{{
 call "\bin\qgis-ltr.bat" --postinstall
 The system cannot find the path specified.
 }}}
 But, if I change to the %OSGEO4W_ROOT% folder and run:
 {{{
 call ".\bin\qgis-ltr.bat" --postinstall
 }}}
 It works...
 N.B. Pre-fixing the `.` ahead of the path allows the command to run....
 and QGIS will then run / load.

 The question now is why does this work on some machines but not others ?
 and what causes the failure? - Seems like some devices can not resolve the
 path as it is specified in the script.

 Does this diagnosis help at all?
-- 
Ticket URL: <https://trac.osgeo.org/osgeo4w/ticket/804#comment:12>
OSGeo4W <http://trac.osgeo.org/osgeo4w>
OSGeo4W is the Windows installer and package environment for the OSGeo stack.