ID 346215 - Opening a project in Hiero 11, with a large number of files, causes a crash due to "Too Many Open Files"

Problem summary
Opening a project in Hiero 11, with a large number of files, causes a crash due to "Too Many Open Files".

Customer reported version
nuke.11.1v3

Steps to reproduce

1) Open Hiero.

2) Open a .hrox project (File > Open Project...) that contains a large number of files. In this case, the project contains 5923 files (see attached .hrox file).

3) Hiero should crash when opening the project.

Reproduced by support
Reproduced by developers.

From the developer's findings, this is a regression since 11.0v1 and the attached project opens as expected in 10.5v5.

Expected behaviour
A project with a large number of files should open.

Actual behaviour
A project with a large number of files crashes when opening, due to "Too Many Open Files".