How to use Megan analyzing Blastn Silva output?

[qicheng]

Hi,

Yesterday i setup a local Silva 123 database for Blastn.

makeblastdb -in LSU.fasta -dbtype nucl -out Silva_LSU

After blastn, i don't know how to analyze the output in MEGAN.

According to the Silva 123 notice, it has MEGAN compatible files as in the follwing website.

https://www.arb-silva.de/no_cache/download/archive/release_123_1/Exports/taxonomy/

tax_TAXNAME_[ls]su_VERSION.{map,tre}
tax_TAXNAME_[ls]su_VERSION.acc_taxid

Then, i download these three files, but i still don't know how to use them?
Which is for "Load RefSeq Mapping file" "Load Gi Mapping File" and "Load Synonyms Mapping File"? Pleas help me.