Ask for help and post your question on how to use XnView MP.
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If possible please upload an example file for Pierre to examine, in a ZIP or similar archive so that it can be attached, 2MiB the current forum attachment size limit, otherwise upload to a file hosting service and post the download link...
If you are using XnView MP, you might check first if Tools > Settings... > General -- General tab is set to Show all graphic formats, although you do say that the file opens blank.
If you are using XnView Classic, there is an equivalent setting in Tools > Options... but I don't have it to hand.