Sorry for the last post..(html work with me...)
SO I say :

When I try to upload this file I have this error

APPLICATION ERROR #15

File upload failed. File is not readable by Mantis. Please check the project settings"

When I try to upload this file I have this error

 When I try to upload this file I have this error

APPLICATION ERROR #15

File upload failed. File is not readable by Mantis. Please check the project settings"

But I configured php.ini :

[MySQL]

upload_max_filesize = 8M
; Maximum size of POST data that PHP will accept.
post_max_size = 8M
upload_max_size= 8M

MySQL.ini :

[mysql]
no-auto-rehash
ax_allowed_packet = 2M

[mysqld]
key_buffer = 384M
max_allowed_packet = 2M
table_cache = 512
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 8M
myisam_sort_buffer_size = 64M
thread_cache_size = 8
query_cache_size = 32M

Try number of CPU's*2 for thread_concurrency

thread_concurrency = 8

And finnaly config_defaults_inc.php
$g_max_file_size = 2000000;
$g_allowed_files = '';
$g_disallowed_files = '';

I install again php,mysql,mantisBT, without my modification, but I always have this issue...

amicably
Arnaud