Rinomino il file prima di salvarlo.

Rinomino comes from the infinitive rinominare, which means to rename.

The ending -o shows that it is:

• present tense
• first person singular
• I rename

So rinomino = I rename.

Like many Italian verbs in -are, it follows a regular pattern:

• io rinomino
• tu rinomini
• lui/lei rinomina
• noi rinominiamo
• voi rinominate
• loro rinominano

Yes. Rinominare is built from:

• nominare = to name
• prefix ri- = often again or re-

So rinominare literally suggests to name again, which is why it means to rename.

This is very common in Italian:

• fare → rifare = to do again / redo
• leggere → rileggere = to read again / reread

File is treated as a masculine noun in Italian, so it commonly takes il in the singular:

• il file
• i file

Even though file is an English loanword and does not change form in the plural, the article still shows number and gender.

So:

• il file = the file
• i file = the files

In everyday Italian, especially in computing, file is the normal word. Native speakers regularly say:

• aprire un file
• salvare un file
• rinominare un file

There may be more technical or less common alternatives in some contexts, but file is the standard everyday term.

Because prima di + infinitive is the normal structure when the subject stays the same.

In this sentence, the person who renames the file is also the person who saves it, so Italian uses:

• prima di salvarlo = before saving it / before I save it

If the subject changes, Italian usually uses prima che + subjunctive:

• Rinomino il file prima che Maria lo salvi. = I rename the file before Maria saves it.

So the difference is mainly:

• prima di + infinitive → same subject
• prima che + verb → usually different subject

Lo is the direct object pronoun meaning it.
With an infinitive, Italian often attaches object pronouns directly to the end of the verb:

• salvare + lo → salvarlo

This is very common:

• vederlo = to see it / seeing it
• farlo = to do it
• aprirlo = to open it

So prima di salvarlo literally has the structure before saving-it.

Lo refers back to il file.

Since file is treated as masculine singular, the correct direct object pronoun is lo.

Compare:

• il file → lo
• la cartella → la

So:

• Rinomino il file prima di salvarlo.
• Rinomino la cartella prima di salvarla.

No. That is not correct in standard Italian.

When a direct object pronoun goes with an infinitive, it is normally attached to the end:

• correct: salvarlo
• not correct: di lo salvare

This is one of the key patterns Italian learners need to get used to:

• voglio farlo
• devo leggerlo
• prima di aprirlo

Italian present tense is used in several ways, just like English present can be.

Rinomino can mean:

• I rename the file before saving it (habitual)
• I’m renaming the file before saving it (current situation, depending on context)
• a general procedure or instruction in conversation

Italian often uses the simple present where English might use:

• simple present
• present progressive
• sometimes even a near-future sense

So the present tense here is completely natural.

Yes. Italian word order is flexible, and this sentence can be rearranged without changing the basic meaning.

For example:

• Rinomino il file prima di salvarlo.
• Prima di salvarlo, rinomino il file.

Both are correct. The second version gives a little more emphasis to before saving it.

Grammatically, yes, but it sounds repetitive.

Italian usually prefers the pronoun once the object is already known:

• more natural: Rinomino il file prima di salvarlo
• less natural: Rinomino il file prima di salvare il file

Using lo makes the sentence smoother and more natural.

Not always word-for-word, but that is the basic meaning.

Depending on the sentence, salvarlo may be translated as:

• to save it
• saving it
• before I save it

In this sentence, English naturally says:

• I rename the file before saving it or
• I rename the file before I save it

So one Italian form can match different English structures.

Yes. Salvare is a broader verb meaning to save in general.

It can mean:

• to save a file
• to save money
• to save someone
• to rescue

Examples:

• Salvo il documento. = I save the document.
• Ha salvato il bambino. = He/She saved the child.

In your sentence, the context makes it clear that salvare means to save a file.