tdf#126641: don't fail on file URLs with fragment

This only fixes part that the URL refuses to open the target file.
Honoring fragment isn't fixed here, since it's the system call to
ShellExecuteExW that in this case internally converts the file URL
into a system path, and strips the fragment from it.

Regression from commit d59ec4cd1660410fa1b18c50d2d83b1417a82ddc.

Change-Id: I6c9ed27e9a5bd7f2780dd3be96f816a6e825e043
Reviewed-on: https://gerrit.libreoffice.org/76778
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit 2207269a84c7c9920af3385b837ce67978c720b4)
Reviewed-on: https://gerrit.libreoffice.org/76848
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
diff --git a/shell/source/win32/SysShExec.cxx b/shell/source/win32/SysShExec.cxx
index 4786e4d..910aae1 100644
--- a/shell/source/win32/SysShExec.cxx
+++ b/shell/source/win32/SysShExec.cxx
@@ -315,7 +315,9 @@ void SAL_CALL CSysShExec::execute( const OUString& aCommand, const OUString& aPa
        }
        if (uri->getScheme().equalsIgnoreAsciiCase("file")) {
            OUString pathname;
            auto const e1 = osl::FileBase::getSystemPathFromFileURL(aCommand, pathname);
            uri->clearFragment(); // getSystemPathFromFileURL fails for URLs with fragment
            auto const e1
                = osl::FileBase::getSystemPathFromFileURL(uri->getUriReference(), pathname);
            if (e1 != osl::FileBase::E_None) {
                throw css::lang::IllegalArgumentException(
                    ("XSystemShellExecute.execute, getSystemPathFromFileURL <" + aCommand