diff --git a/core/src/errors.rs b/core/src/errors.rs
index 7da4d73..07fde48 100644
--- a/core/src/errors.rs
+++ b/core/src/errors.rs
@@ -9,6 +9,7 @@ pub mod threads;
 
 pub mod auth;
 pub mod authors;
+pub mod files;
 pub mod games;
 pub mod uploads;
 pub mod users;
diff --git a/core/src/errors/files.rs b/core/src/errors/files.rs
new file mode 100644
index 0000000..30b4448
--- /dev/null
+++ b/core/src/errors/files.rs
@@ -0,0 +1,8 @@
+use eva::data;
+
+use crate::types::file;
+
+#[data(copy, display("file {id} was not found"), error)]
+pub struct NotFound {
+    pub id: file::Id,
+}
diff --git a/core/src/requests/files.rs b/core/src/requests/files.rs
index 8b13789..b81aad6 100644
--- a/core/src/requests/files.rs
+++ b/core/src/requests/files.rs
@@ -1 +1,23 @@
+use eva::data;
 
+use crate::{errors, types::file};
+
+pub mod get_info {
+    use super::*;
+
+    #[data]
+    pub struct Args {
+        pub id: file::Id,
+    }
+
+    #[data]
+    pub struct Ok {
+        pub info: file::FileInfo,
+    }
+
+    #[data(error)]
+    pub enum Err {
+        #[display("{_0}")]
+        NotFound(#[from] errors::files::NotFound),
+    }
+}
diff --git a/core/src/requests/uploads.rs b/core/src/requests/uploads.rs
index 8298323..ee1576d 100644
--- a/core/src/requests/uploads.rs
+++ b/core/src/requests/uploads.rs
@@ -75,7 +75,7 @@ pub mod finish {
     }
 }
 
-pub mod cancel {
+pub mod abort {
     use super::*;
 
     #[data]
diff --git a/core/src/types/file.rs b/core/src/types/file.rs
index 50c2106..cebc0df 100644
--- a/core/src/types/file.rs
+++ b/core/src/types/file.rs
@@ -3,13 +3,36 @@
 //! Basically same as [`entity::Id`], but additionally stores server where file is located in
 //! two lowest bits of random.
 
-use std::{mem, num::NonZeroU128, str::FromStr};
+use std::{
+    mem,
+    num::{NonZeroU64, NonZeroU128},
+    str::FromStr,
+};
 
-use crate::types::entity;
-use eva::{data, hash::blake3, int, str, str::ToCompactString};
+use crate::{
+    types::entity,
+    world::{World, WorldMut},
+};
+use eva::{data, hash::blake3, int, rand::Rng, str, str::ToCompactString, time::Clock};
 
 pub type Hash = blake3::Hash;
 
+#[data]
+pub struct FileInfo {
+    pub id: Id,
+    pub format: FileFormat,
+    pub class: Class,
+    pub size: NonZeroU64,
+}
+
+#[data(copy)]
+pub enum FileFormat {
+    #[display("image:{_0}")]
+    Image(ImageFormat),
+    #[display("opaque")]
+    Opaque,
+}
+
 #[data(copy, ord, display(name))]
 pub enum ImageFormat {
     Png,
@@ -109,6 +132,10 @@ entity::define_eid! {
 }
 
 impl Id {
+    pub fn new<W: WorldMut>(mut w: World<W>, server: Server) -> Self {
+        Self::from_parts(w.clock().get().as_millis(), w.rng().random(), server)
+    }
+
     pub const fn from_parts(millis: u64, random: u128, server: Server) -> Self {
         let id = entity::Id::from_parts(
             millis,
@@ -119,7 +146,6 @@ impl Id {
     }
 
     pub const fn server(self) -> Server {
-        // It's still possible that ID is invalid because of deserialization.
         unsafe { mem::transmute::<u8, Server>(self.0.metadata().data() & 0b111) }
     }