Bug#905652: vcmi: crashes with 'Unknown map format' when starting a new campain

[cacatoes at tuxfamily.org]

Package: vcmi
Version: 0.99+dfsg-4+b1

Hello,

I installed HOMM3 complete edition 4.0 from GOG.
Installation is all fine. 

Starting the game.

What does not work:
Trying a new campaign crashes the game after the introduction video.

What does work:
Starting a new single scenario.

Please see attached log.

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: i386 (i686)

Kernel: Linux 4.9.0-7-686-pae (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages vcmi depends on:
ii  libavcodec58                    7:4.0.2-1
ii  libavformat58                   7:4.0.2-1
ii  libavutil56                     7:4.0.2-1
ii  libboost-atomic1.62.0           1.62.0+dfsg-8
ii  libboost-chrono1.62.0           1.62.0+dfsg-8
ii  libboost-date-time1.62.0        1.62.0+dfsg-8
ii  libboost-filesystem1.62.0       1.62.0+dfsg-8
ii  libboost-locale1.62.0           1.62.0+dfsg-8
ii  libboost-program-options1.62.0  1.62.0+dfsg-8
ii  libboost-system1.62.0           1.62.0+dfsg-8
ii  libboost-test1.62.0             1.62.0+dfsg-8
ii  libboost-thread1.62.0           1.62.0+dfsg-8
ii  libc6                           2.27-5
ii  libfuzzylite5.1v5               5.1+dfsg-5
ii  libgcc1                         1:8.2.0-1
ii  libminizip1                     1.1-8+b1
ii  libqt5core5a                    5.10.1+dfsg-7
ii  libqt5gui5                      5.10.1+dfsg-7
ii  libqt5network5                  5.10.1+dfsg-7
ii  libqt5widgets5                  5.10.1+dfsg-7
ii  libsdl2-2.0-0                   2.0.8+dfsg1-1
ii  libsdl2-image-2.0-0             2.0.3+dfsg1-1
ii  libsdl2-mixer-2.0-0             2.0.2+dfsg1-2
ii  libsdl2-ttf-2.0-0               2.0.14+dfsg1-2
ii  libstdc++6                      8.2.0-1
ii  libswscale5                     7:4.0.2-1
ii  zlib1g                          1:1.2.11.dfsg-1

Versions of packages vcmi recommends:
ii  ffmpeg       7:4.0.2-1
ii  innoextract  1.7-1
pn  unshield     <none>
ii  unzip        6.0-21

Versions of packages vcmi suggests:
pn  homm3-demo-data | homm3-data  <none>

-- no debconf information